Suppose you have $10,000 in cash and you decide to borrow another $10,000 at a 6% interest rate to invest in the stock market. You invest the entire $20,000 in an exchange traded fund (ETF) with a 12% expected return and a 20% volatility. The volatility of your investment is closest to:

Select one:

a. 24%

b. 30%

c. 20%

d. 40%