Shirt for £97 + mam £1 + dad £1 + I keep £1 = £100
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I owe mam £49 and dad £49 dats £98 plus the £1 I kept
In this sentence, you subtracted the £2 you gave to your parents from the £100 for a total of £98. So the £1 you kept should also be subtracted, not added, making a total of £97 which is the cost of the shirt.