On March 5, 2018, you were hired by Marin Inc., a closely held company, as a staff member of its newly created internal auditing department. While reviewing the company's records for 2016 and 2017, you discover that adjustments have yet been made for the items listed below. Items Interest income of $15,300 was not accrued at the end of 2016. It was recorded when received in February 2017. 1. A computer costing $4,080 was expensed when purchased on July 1, 2016. It is expected to have a 4-year life with no salvage value. The company typically uses straight-line depreciation for all fixed assets. 2. Research and development costs of $31,500 were incurred early in 2016. They were capitalized and were to be amortized over a 3-year period. Amortization of $10,500 was recorded for 2016 and $10,500 for 2017. 3. On January 2, 2016, Marin leased a building for 5 years at a monthly rental of $8,700. On that date, the company paid the following amounts, which were expensed when paid. 4. Security deposit $18,000 First month's rent 8,700 Last month's rent 8,700 $35,400 The company received $33,900 from a customer at the beginning of 2016 for services that it is to perform evenly over a 3-year period beginning in 2016. None of the amount received was reported as unearned revenue at the end of 2016. 6. Merchandise inventory costing $19,100 was in the warehouse at December 31, 2016, but was incorrectly omitted from the physical count at that date. The company uses the periodic inventory method. 5. Indicate the effect of any errors on the net income figure reported on the income statement for the year ending December 31, 2016, and the retained earnings figure reported on the balance sheet at December 31, 2017. Assume all amounts are material, and ignore income tax effects. Using the following format, enter the appropriate dollar amounts in the appropriate columns. Consider each item independent of the other items. It is not necessary to total the columns on the grid. Net Income for 2016 Retained Earnings 12/31/17 Understated Overstated Overstated Understated Item 15,300 1. 2. 3,560 2,540 3. 21000 10,500 26,700 4. 26,700 22,600 11,300 19,100 6