The marketing department has estimated sales as follows for the remainder of

the year: $($Actual sales in June were $5,000$ units$)$

July $8,000$ October

August $15,000$ November

September $12,000$ December

The selling price of a SUPER DUPER widget is $$35$ and all sales are on account.

Based on past experience, sales are collected in the following pattern:

$40\%$ in the month of sale

$55\%$ in month following the sale

$5\%$ are never collected