Your company is considering granting credit to a new customer for a one$-$time sale. The variable cost per unit is $$30$; the current price per unit is $$60$; and the monthly required return $($cost of capital$)$ is $2\%.$ What probability of default for the new customer would make the firm break even when granting credit for the one$-$time sale?

A$)2\%$ B$)49\%$ C$)51\%$ D$)98\%$ E$)99\%$