The tens digit of a certain number is five more than the units digit. the sum of the digits is 9. find the number. i need to turn this in in 20 minutes

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?