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Question

If the cost price of 12 identical books is ₹960 and the cost price of 8 identical pens is ₹320, find the total cost price (in ₹) of 15 books and 10 pens of the same kind.

This question was previously asked in
RRB ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is
1600

Calculating Individual Item Costs

First, find the cost price of a single book and a single pen.

  • Cost price of 12 books = ₹960
  • Cost price of 1 book = \(\frac{₹960}{12} = ₹80\)
  • Cost price of 8 pens = ₹320
  • Cost price of 1 pen = \(\frac{₹320}{8} = ₹40\)

Calculating Total Cost Price

Next, calculate the cost for the required number of books and pens and sum them up.

  • Cost price of 15 books = \(15 \times ₹80 = ₹1200\)
  • Cost price of 10 pens = \(10 \times ₹40 = ₹400\)
  • Total cost price = Cost of 15 books + Cost of 10 pens
  • Total cost price = \(₹1200 + ₹400 = ₹1600\)

The total cost price of 15 books and 10 pens is ₹1600.

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