(100 points)last one i promise lol

The ivring berlin learning center would like a possible net profit of $650,000 on its new resource manual it sells to schools. the fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. if the estimated unit sales are 1,250,000 units, what selling price unit should the ivring berlin learning center try?

Ineed on this question me get the answer

Solve for b. ab + c= d b= a + old ob=allc-ch b= (d-c/a