Question #744

Duncan checks his investments everyday. One friday, he missed the news and did not know if there was a gain or a loss. His mother told him that the overall value dropped $210 during the week . That was his gain or loss on the friday.
Monday Tuesday Wednesday Thursday Friday
+300 -193 -25 +51 ?

Expert's answer

The overall value of the week can be found by summing all investments. Let X be the investment on Friday, then

I(overall) = +$300-$193-$25+$51+X = -$210;

133+X = -210;

X = -343;

Thus on Friday there was loss of $343.

I(overall) = +$300-$193-$25+$51+X = -$210;

133+X = -210;

X = -343;

Thus on Friday there was loss of $343.

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