When the price of a portable hard disk is reduced by 24%, its sale increases by 35%. What is the net percentage change in the total revenue? 

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  1. 6.2% increase
  2. 2.6% decrease
  3. 6.2% decrease
  4. 2.6% increase

Answer (Detailed Solution Below)

Option 4 : 2.6% increase
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RPF Constable Full Test 1
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Detailed Solution

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Given:

Price of portable hard disk is reduced by 24%, and the sale increases by 35%. We need to find the net percentage change in total revenue.

Formula used:

Net percentage change in revenue = (Percentage change in price) + (Percentage change in quantity) + (Percentage change due to both)

Calculations:

Let the original price of the hard disk be P and the original quantity sold be Q.

New price = P × (1 - 24/100) = 0.76P.

New quantity sold = Q × (1 + 35/100) = 1.35Q.

The new revenue is:

New Revenue = New price × New quantity = 0.76P × 1.35Q = 1.026PQ.

The original revenue was: Original Revenue = P × Q = PQ.

The net percentage change in revenue is:

Net percentage change in revenue = [(New Revenue - Original Revenue) / Original Revenue] × 100

→ Net percentage change in revenue = [(1.026PQ - PQ) / PQ] × 100

→ Net percentage change in revenue = (0.026PQ / PQ) × 100

→ Net percentage change in revenue = 2.6%.

∴ The net percentage change in the total revenue is an increase of 2.6%.

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