how do i calculate the breakeven revenue if i do not know how many units make up total revenue

I am provided with Revenues, variable costs, fixed costs, and operating income and need to calculate the breakeven revenue. However, I do not know how to figure out the # units sold in order to do so. The picture of my hw question is attached for further clarity. Only parts 1 and 2 (though I can figure out 2 if I can solve 1)..