Shirley Has Made the Following Predictions for Her Business for the First

Shirley has made the following predictions for her business for the first six months of trading to 30 June:
Sales in Jan, Feb and March = £30,000 per month.
Sales in Apr, May and June = £45,000 per month.
Sales will be on one month's credit,
Purchases will be for cash.
The total cash received from customers during the six months ended 30 June, will be:

A) £180,000.
B) £225,000.
C) £195,000.
D) £210,000.