A firm is thinking of buying a printer for its office use for the next one year. The criterion for choosing is based on the least per-page printing cost. It can choose between an inkjet printer which costs Rs. 5000 and a laser printer which costs Rs. 8000. The per-page printing cost for an inkjet is Rs. 1.80 and that for a laser printer is Rs. 1.50. The firm should purchase the laser printer, if the minimum number of a pages to be printed in the year exceeds

1. 5000
2. 10000
3. 15000
4. 18000

Solution

Let minimum number of pages to be printed be x.

Cost for inkjet printer = Cost for laser printer

5000 + 1.8x = 8000 + 1.5x

x = 10000

The correct option is B.