A company bought a total of 60 computers and 20 printers to modernise billing operations. If the price of each computer was three times the price of each printer, what percent of the total cost of the purchase was the total cost of the printers?
(a)10\%
(b)11\%
(c)15\%
(d)20\%
Answer
Answer (as printed): A
Explanation
Let the price of each printer be ₹ $x$. Then, price of each computer $=₹(3 x)$. Total cost of printers $=₹(20 x)$. Total cost of purchase $=₹(60 \times 3 x+20 x)=₹(200 x)$. $$\text { ∴ } \text { Required percentage }=\left(\frac{20 x}{200 x} \times 100\right) \%=10 \% .$$
Explanation as extracted from the printed page; notation may be imperfect.