Question
Ratio of Cost price to selling price of a book is 5:6
and ratio of selling price to marked price is 4:5. Marked price of the book is by what percent more than that of cost price of the book?Solution
CP : SP = 5 : 6 --- (1) × 2 SP : MP = 4 : 5 --- (2) × 3 CP : SP : MP = 10 : 12 : 15 = 10x : 12x : 15x MP is more than CP by = 15x – 10x = 5x ∴  MP is more than CP by = (5x/10x) × 100 = 50%
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