1. Prepare adjusting entries at December 31 for these four activities. If no entry is required, select "No entry required". If an amount box does not require an entry, leave it blank. a. In December, Sentry received $3,500 cash in advance from Rich's Department Store for an estimated 175 deliveries during the next 3 months. The entire amount was recorded as unearned revenue when received. During December, 55 deliveries were made for Rich's Dec. 31 b. Sentry operates several small buses that take commuters from suburban communities to the central downtown area of Atlanta. The commuters purchase, in advance, tickets for 50 one-way rides. Each 50-ride ticket costs $500. At the time of purchase, Sentry credits the cash received to unearned revenue. At year end, Sentry determines that 10,350 one-way rides have been taken. Dec. 31 6. Sentry operates several buses that provide transportation for the clients of a social service agency in Atlanta, Sentry bills the agency in advance at the end of January, April, July, and October for the service to be performed over the next 3 months. The contract price is $8,700for each 3-month period. Sentry property recognizes revenue in the period in which the service is performed Dec. 31 d. on December 23, Delta Airlines chartered a bus to transport its marketing group to a meeting at a resort in southern Georgia. The meeting will be held during the last week in January, and Delta agrees to pay for the entire trip on the day the bus departs. At year ipd, none of these arrangements have been recorded by Sentry Dec. 31 11 2. Conceptual Connection: What would be the effect on revenue if the adjusting entries were not made? by $