For each of the following situation, solve for a missing amount. In each case, there is only one debit entry and one credit entry In the account during the month. Requirement 1: a. Accounts Recelvable had a balance of $840 at the beginning of the month and $630 at the end of the month. Credit sales totaled $8.400 during the month. Calculate the cash collected from customers during the month, assuming that all sales were made on account. b. The Supplies account had a balance of $378 at the beginning of the month and $511 at the end of the month. The cost of supplies used during the month was $1,638. Calculate the cost of supplies purchased during the month. c. Wages Payable had a balance of $287 at the beginning of the month. During the month, $2660 of wages were pald to employees. Wages Expense accrued during the month totaled $2,870. Calculate the balance of Wages Payable at the end of the month. Requirement 2 ; Prepare the journal entrles for the above transactions. (If no entry is required for a transaction/event, select "No journal entry requlred" in the first account field.)