I have question can anybody explain and show the calculation how they find the cash sales 29,400 and 30,380 in July and Aug respectively? And also do where they find the number credit sales May 76,880, June 88,800, July 117,600 and August 121,520?

Al Call Pty Ltd is preparing a sales budget and a forecast of cash collections from sales for July and August 2017 The following information is provided:- Actual Sales in Units:- May 2017 June 2017 16,000 18,500 Forecast Sales in Units:- July 2017 August 2017 21,000 21,700 The sales price per unit was $6.00 per unit for May and June 2017 and was increased to st $7 per unit effective of 1 July 2017. Sales are made on both cash and credit basis-80% of all sales are on credit and 20% are for cash. Cash collections from credit customers are: 70% in the month of sale 20% in the month following the sale 10% in the second month following the sale . Required: I. II. Prepare a sales budget for the months of July and August 2017; and Prepare a schedule of cash collections for the month of July and August, 2017