At a sale, coats were sold for $180 each. This price was 90% of a coat's original price. How much did a coat originally cost?

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?