[tex]\\ \text{Let Manas receives a commission of Rs. 5000 on sales of Rs. 65000}\\ \\ \text{We need to find how much commision he will get on the sale of Rs.20000}\\ \\ \text{To find the commision, we use the unitary method.}\\ \\ \text{On sales of Rs. 65000, Manas receives a commision of}=5000\\ \\ \text{so on sales of Rs. 1, Manas will receiv a commision of}=\frac{5000}{65000}\\ \\ \text{Hence on sales of Rs. 20000, Manas will receiv a commision of}\\ \\=\frac{5000}{65000}\times 20000\\ \\ =1538.46[/tex]
Hence, on the sales of Rs. 20000, Manas will receive a commission of: Rs. 1538.46
