Question

1. A consumer in consumption of two
commodities A and B is at equilibrium.
The prices of A and B are Rs.10 and
Rs.20 respectively and the marginal
utility of product B is 50. What will be
the marginal utility of product A?
(a) 100
(b) 25
(c) 250
(d) 4

Answer 1

so

answer is (b)

I think it is clear now