Following is an excerpt from the Packer Inc. year$-$end trial balance dated December $31.$

Selected Adjusted Trial Balance Amounts

Acct. No$.$

Description

Debit

Credit

$400$

Sales revenue

$..........................$

$$70,000$

$402$

Consulting revenue

$......................$

$1,000$

$404$

Gain on sale of investments

$...............$

$2,800$

$510$

Cost of goods sold

$......................$

$$25,000$

$511$

Selling expense

$........................$

$11,000$

$512$

Salaries expense

$.......................$

$3,000$

$520$

Rent expense

$..........................$

$2,000$

$526$

Insurance expense

$......................$

$500$

$528$

Depreciation expense

$....................$

$1,000$

$530$

Research and development expense

$........$

$5,000$

$535$

Loss on sale of investments

$...............$

$1,800$

$540$

Interest expense

$........................$

$500$

$542$

Income tax expense

$.....................$

$1,950$

Note: Consulting revenue is nonoperating revenue.

Required

a$.$

Compute gross pro$$t for the year.

b$.$

Compute operating income for the year.