Please help with this question

Here is a forecast of sales by National Bromide for the first 4 months of 2019 (figures in thousands of dollars):

Month: 1 2 3 4

Cash sales 19 28 22 18

Sales on credit 120 140 110 90

On average, 50% of credit sales are paid for in the current month, 30% in the next month, and the remainder in the month after that.

What are the expected cash collections in months 3 and 4?