Answer:
$36,230
Explanation:
Month 1 Â Â Â Â Â Â Â Month 2 Â Â Â Â Â Â Â Month 3 Â Â Â Â Â Â Â Â Month 4
60,000 Â Â Â Â Â Â Â 70,000 Â Â Â Â Â Â Â Â 50,000 Â Â Â Â Â Â Â Â Â 30,000
Calculation for receipts in Month 4:
9000  30% cash  in the same month(30000*30%)
12600 Â 60% credit in the same month (30000*70%*60%
8750 Â 25% in month following sales (50000*70%*25%)
5880 Â 12% second month following sales (70000*70%*12%)
36,230
I hope I made myself clear buddy.
Best of Luck.