Cost of 1/4 dozen of bananas is Rs. 2.35, then what is the approximate cost of 42 dozen of bananas?

∵ 1 dozen = 12
⇒ 1/4 dozen = 1/4 x 12 = 3
∵ Cost of 3 bananas = Rs. 2.35
⇒ Cost of 1 banana = Rs. 2.35/3
∴ Cost of 42 x 12 bananas = (2.35 x 42 x 12 ) / 3
= Rs. 394.80
= Rs. 400 (Approximately)