This is all I got from the question.

Suppose you own IBM, which is currently trading at 125. A put on IBM, struck at 125 and expiring in 1 year, costs $12.50. What does a call with a similar strike cost? What is this called? Suppose the volatility of IBM vol doubles, from 25% to 50%. How much does the cost of the put go up by? What about the call? Suppose you own IBM, which is currently trading at 125. A put on IBM, struck at 125 and expiring in 1 year, costs $12.50. What does a call with a similar strike cost? What is this called? Suppose the volatility of IBM vol doubles, from 25% to 50%. How much does the cost of the put go up by? What about the call