Question

a dozen of notebooks cost RS186 what is the cost of 8 notebooks

Answer 1

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Answer 2

dozen = 12
12 notobooks = 186/-
8 notebooks = ?

(ratio proportion method)

12:186::8:x
{product of means=product of extremes)
12*x = 186*8
12x = 1488
x = 1488 / 12
x = 124

cost of 8 notebooks = 124