DRDO Multi tasking staff Model paper 8

Marked Price (MP) = (10/7) Cost Price (CP) ----(1)
Selling Price (SP) = (4/5) Marked Price (MP) ----(2)
Substituting MP from Equation 1 in Equation 2, we get SP = (4/5) × (10/7) × CP = (8/7) CP
Profit Percentage = [(SP – CP)/CP] × 100 = [(8/7CP - CP)/CP] × 100 = (1/7) × 100 = 14.28%
∴ Required Percentage = 14.28%