$19\mathrm{.}1$ Joe's is a small ice$-$cream shop located near the local university's baseball field. Joe's serves walk$-$in customers only. The shop carries $26$ flavors of ice cream. Customers can buy cones, sundaes, or shakes. When a customer pays for an individual purchase, a sales transaction usually includes just one item. When a customer pays for a family or group purchase, however, a single sales transaction includes many different items. All sales must be paid for at the time the ice cream is served. Joe's maintains several banking accounts but deposits all sales receipts into its main checking account.

REQUIRED

Draw an REA diagram, complete with cardinalities, for Joe's revenue cycle.

$19\mathrm{.}2$ Joe, the owner of the ice$-$cream shop, purchases ice cream from two vendors. Over the years, he has developed good relationships with both vendors, and they allow Joe to pay them biweekly for all purchases made during the preceding two$-$week period. Joe calls in ice$-$cream orders on Mondays and Thursdays. The orders are delivered the next day. Joe buys ice$-$cream toppings from one of several local stores and pays for each such purchase at the time of sale with a check from the company's main checking account.

REQUIRED

Draw an REA diagram, complete with cardinalities, for Joe's expenditure cycle.