An investment costs $80 and offers a payoff of $100 with probability p and $0 with probability 1-p. (In this case 1-p is the probability of defaiult). Time-equivalent Treasuries offer an interest rate of 7% (In other words, the risk free rate for the period). Assume risk neutrality, i.e. the expected return on any security of the same time duration should be the same regardless of how risky the payoff is.

What is the promised return of the investment? (i.e. the return realized if you get the payoff of $100)?