Question

The cost of 1 kg of potato is ₹60. 1 kg of onions costs 10% less than 1 kg of potato. If I pay ₹180 for potatoes, then what will be the cost of onions? (weight of onions is same as that of the potatoes)

• A. ₹160
• B. ₹162
• C. ₹172
• D. ₹170

Answer 1

The correct option is B ₹162

The cost of 1 kg potato = ₹60
The cost of 1 kg onion is 10% less than 1 kg of potato.
$\frac{10}{100}\times 60=6$
$\Rightarrow$ 60 - 6 = ₹54
Therefore, cost of 1 kg onion = ₹54

Weight of potatoes that cost ₹180 = $\frac{Totalcost}{Costof1kgpotatoes}$
Hence, weight of potatoes
$=\frac{180}{60}=3kg$

The weight of onions and potatoes are equal.
Cost of 1 kg onion = ₹54
Therefore, cost of 3kg onions = 3 x 54 = ₹ 162.