One month, a salesman sold goods worth P23 482. He earns 11.5% commission on the sales he makes. (a) Calculate the commission he earned from the sales of that month. (b) The salesman also has a monthly salary of P1857.28. Calculate the total income of that month.

The salesman sold goods worth P23 482 and earned 11.5% commission.
Commission = $11.5\%$ of P23 482
Commission = $\frac{11.5}{100} \times 23482$
Commission = $0.115 \times 23482$
Commission = P2700.43
The commission earned is $\boxed{\text{P2700.43}}$.

The salesman has a monthly salary of P1857.28 and earned a commission of P2700.43 (from part a).
Total income = Monthly salary + Commission
Total income = P1857.28 + P2700.43
Total income = P4557.71
The total income for that month is $\boxed{\text{P4557.71}}$.