Question #8745

Caffeine absorption.after caffeine is absorbed into the body 13% is eliminated from the body each hour.assume a person drinks an 8 Oz cup of brewed coffee containing 130mg of caffeine,and the caffeine is absorbed immediately into the body.Write a program to compute the following values.the number of hours required until 65mg(one-half the orginal amount remain in the body.the amount of caffeine in the body 24hours after the person drinks the coffee

looking for the code

looking for the code

Expert's answer

Just make the form in any VB version with 1 button, and add corresponding code.

The answer is 5 hours and 4mg.

Just in case, about 0,87:

(X*100%-X*13%)/100%=x*87%/100%=X*0,87

So to remove 13% we just multiply by 0,87

Public Class Form1

Dim caff_dose As Integer 'to count current dose

Dim hour As Integer 'to count hours

Dim caff_half_dose_time As Integer 'to hold found 1 question value

Dim hour24_left As Integer 'to hold found 2 question value

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

'initial values

caff_dose = 130

hour = 0

While caff_dose > 65 'the loop will end when the dose would fall below 65

hour = hour + 1 'increasing hours

caff_dose = caff_dose * 0.87 'decreasing dose

MsgBox("HALF DOSE TIME: on hour " & hour quot; we have " & caff_dose quot;mg") 'you can remove this line, just to show loop output

caff_half_dose_time = hour 'so when the loop stops we will have desired number

End While

'initial values again

caff_dose = 130

hour = 0

While hour < 24 'the loop will end on 24-th hour

hour = hour + 1 'same as above loop

caff_dose = caff_dose * 0.87 'same as above loop

MsgBox("24 HOURS: on hour " & hour quot; we have " & caff_dose quot;mg") 'you can remove this line, just to show loop output

hour24_left = caff_dose 'so we have the second value

End While

MsgBox("The number of hours required until 65mg amount remain in the body is " & caff_half_dose_time)

MsgBox("The amount of caffeine in the body 24hours after the person drinks the coffee is " & hour24_left)

End Sub

End Class

The answer is 5 hours and 4mg.

Just in case, about 0,87:

(X*100%-X*13%)/100%=x*87%/100%=X*0,87

So to remove 13% we just multiply by 0,87

Public Class Form1

Dim caff_dose As Integer 'to count current dose

Dim hour As Integer 'to count hours

Dim caff_half_dose_time As Integer 'to hold found 1 question value

Dim hour24_left As Integer 'to hold found 2 question value

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

'initial values

caff_dose = 130

hour = 0

While caff_dose > 65 'the loop will end when the dose would fall below 65

hour = hour + 1 'increasing hours

caff_dose = caff_dose * 0.87 'decreasing dose

MsgBox("HALF DOSE TIME: on hour " & hour quot; we have " & caff_dose quot;mg") 'you can remove this line, just to show loop output

caff_half_dose_time = hour 'so when the loop stops we will have desired number

End While

'initial values again

caff_dose = 130

hour = 0

While hour < 24 'the loop will end on 24-th hour

hour = hour + 1 'same as above loop

caff_dose = caff_dose * 0.87 'same as above loop

MsgBox("24 HOURS: on hour " & hour quot; we have " & caff_dose quot;mg") 'you can remove this line, just to show loop output

hour24_left = caff_dose 'so we have the second value

End While

MsgBox("The number of hours required until 65mg amount remain in the body is " & caff_half_dose_time)

MsgBox("The amount of caffeine in the body 24hours after the person drinks the coffee is " & hour24_left)

End Sub

End Class

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