hi i am trying to figure out to solve

Lin Corporation has a single product whose selling price is $120 per unit and whose variable expense is $80 per unit. The company's monthly fixed expense is $50,000.

2. Calculate the dollar sales needed to attain a target profit of $15,000.

but i cant , I used the

Target profit=MC%*sale-fixed expense , but still i cant get the dollar sale , can you please help