Question
To gain 8% after allowing a discount of 10%, by what per cent cost price should be hiked in the list price ?
Answer: Option B
Answer: (b)Let the cost price be Rs.100and marked price be x.${x × 90}/100 = 108$${9x}/10 = 108$$x = {108 × 10}/9 = 120$Required Percent = 20%Using Rule 8,Here, Gain % = 8%, $r_1$ = 10%, r = ?Gain % = ${r × (100 - r_1)}/100 - r_1$8 = ${r × (100 - 10)}/100 - 10$8 = ${r × 90}/100 - 10$8 = ${r × 9}/10$ = 20%
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Answer: (b)Let the cost price be Rs.100and marked price be x.${x × 90}/100 = 108$${9x}/10 = 108$$x = {108 × 10}/9 = 120$Required Percent = 20%Using Rule 8,Here, Gain % = 8%, $r_1$ = 10%, r = ?Gain % = ${r × (100 - r_1)}/100 - r_1$8 = ${r × (100 - 10)}/100 - 10$8 = ${r × 90}/100 - 10$8 = ${r × 9}/10$ = 20%
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