8. Cream Soda bottles are sold for cash at R12 per bottle. If the customer returns the bottle, he/she receives a R1.20 refund. The seller must include R10.80 in gross income for every bottle sold.
If the customer returns the bottle and receives a R1.20 refund, then the seller must include R12 in gross income for every bottle sold, because R1.20 refund is a part of cost paid for future not to pay for producing one more bottle.
So, the statement is false.