Bayes Theorem-Probabilty Question

Hello Hi everybody!

Here is a new thread I faced difficult in solving please give me the way out.

__Question;__

Michael Schofield, credit manager for Lincoln Burrows knows that the company uses three methods to encourage collection of delinquent accounts. From the past collection records, he learn that 70% of the accounts are called on personally, 20% are phoned, and 10% are sent a letter. The probabilities of collecting an overdue amount from an account of the three methods are 0.75, 0.60 and 0.65 respectively. Scofield has just received payment from the past due account what is the probability that this account;

(a) Was called on personally

(b) Received a phone call

(c) Received a letter

**end**

I look forward to getting a good start!!1