Correct Answer - Option 1 : 42.85% Loss
Given:
40% of CP = 70% of SP
Formula used:
Profit = Selling Price – Cost Price
Profit % = (Profit)/(Cost price) × 100
Loss = Cost Price – Selling Price
Loss % = (Loss)/(Cost price) × 100
Calculation:
Let the CP be ‘a’
According to the question,
⇒ 40/100 × a = 70/100 × SP
⇒ SP = 40a/70
⇒ SP = 4a/7
Loss = CP – SP
⇒ Loss = a – 4a/7 = 3a/7
Loss % = Loss/CP × 100
⇒ Loss % = (3a/7)/a × 100
⇒ Loss % = 300/7 % = 42.85%
∴ The loss percent is 42.85%
Alternate Method:
40% of CP = 70% of SP
⇒ 40/100 × CP = 70/100 × SP
⇒ SP/CP = 4/7
Loss = CP – SP
⇒ Loss = 7 – 4 = 3
⇒ Loss % = Loss/CP × 100
⇒ Loss % = 3/7 × 100 = 300/7 = 42.85%
∴ The loss percent is 42.85%