Required: Each of the following independent events requires a yeat-end adjusting entry. Show how each event and its related adjusting entry affect the accounting equation. Assume a December 31 closing date. The first event is recorded as an example. Note: Do not round intermediate calculations. Enter any decreases to account balances with a minus sign. Leave cells blank if no input is needed. a. Paid $4,800 cash in advance on October 1 for a one-year insurance policy. b. Received a $3,600 cash advance for a contract to provide services in the future. The contract required a one-year commitment, starting April 1. c. Purchased $1,200 of supplies on account. At year's end, $175 of supplies rer, ained on hand. d. Paild $9,600 cash in advance on August 1 for a one-year lease on office space