For each of the independent cases, prepare the required adjusting entry.

a$.$ Unadjusted balance in the Prepaid Insurance account on December $31.$

Unexpired coverage as of December $31.$

b$.$ Supplies account balance at beginning of year.

Supplies purchased during the year $($recorded as Supplies$)$

Physical count of supplies at December $31.$

$$8,000$

$1,760$

$$1,050$

$3,600$

$740$

Cash received from customers in advance of performing services

$($recorded as Unearned revenue$).$

Portion of work completed as of Decenber $31.$

$$15,000$

$$6,900$

$2,300$

e$.$ Cost of equipment purchased on January $1$ of current year

$$37,000$

$7,000$

Estimated salvage value

Estinated useful life $($years$)$

The equipment is being depreciated using the straight$-$line method.