題目:Tom has a sum of money to buy 60 stamps

Let $y be the price of each stamp after the price increase.
Then the price of each stamp before the price increase = $(y - 0.3)

Cost of 60 stamps before the price increase = $60(y - 0.3)
Cost of (60 - 12) stamps after the price increase = $(60 - 12)y

60(y - 0.3) = (60 - 12)y
60y - 18 = 48y
12y = 18
y = 1.5

Ans: The price of each stamp after the price increase is $1.5
=

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