Answer and Explanation:
The Preparation of cash receipts from sales for the month of May is shown below:-
March Sales
Credit sales  $240,000 × 80% × 3%    $5,760
April sales
Credit sales $210,000 × 80% × 35%   $58,800
May sales
Credit sales $330,000 × 80% × 60%   $158,400
Cash sales  $330,000 ×       ×  20% $66,000
Total Cash receipts                 $288,960
Therefore we add March credit sales, April credit sales, may credit sales and may cash sales to reach total cash receipts.