Find the Average Daily Balance

Suppose the charge account of Strong's Mailing Service at the local supply store had a 1.8 interest rate per month on the average daily balance. Find the average daily balance if Strong's had an unpaid balance on March 1 of $199.60, a payment of $40 posted on March 6 , and a purchase of $32.30 posted on March 17. The billing cycle ends March 31. The average daily balance is $ Truna an intanar ar danimal miundad ta tha naaroct hundradth ae naadad