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Answer

number of :
books ——- 4u
files ——- 1u

price of :
books ——- 1p – 10
files ——- 1p

300 – 60 = 240
240/2 = 120 (cost of 4u of books)
120/4 = 30 (cost of 1u of books)
120 + 60 = 180 (cost of 1u of files)
1u x 1p = 1up ——– 180
1u x (1p – 10) = 1up – 10u ——- 30
10u ——- 180 – 30 = 150
1u ——- 150/10 = 15
180/15 = 12

Ans : $12.

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