Producer surplus is the amount a seller is paid minus the cost of production

Assuming that one dollar trades for 50 rupees, what is the dollar cost of 750 rupees?

A) $50 B) $75 C) $5 D) $15

In the long run, price elasticities of demand are usually 

A. greater than they are in the short run because consumers have time to adjust. B. the same as they are in the short run because tastes don't change. C. less than they are in the short run because prices rise over time. D. less than they are in the short run because real prices fall over time.