The following information relates to a company's operations for last year.

Sales$1,750,000Variable expenses520,000Contribution margin1,230,000Fixed expenses880,000Net operating income$350,000Average operating assets$875,000

At the beginning of this year, the company has a $200,000 investment opportunity with the following cost and revenue characteristics:

Sales$320,000Contribution margin ratio60% of salesFixed expenses$128,000

The company's minimum required rate of return is 20%.

1. Calculate last year's return on investment (ROI).

2. Calculate the ROI related to this year's investment opportunity.

3. If the company pursues the investment opportunity and otherwise performs the same as last year, what ROI will it earn this year?(Round your percentage answer to 1 decimal place (i.e., 0.1234 should be considered as 12.3%.)

4. Calculate last year's residual income.

5. Calculate the residual income of this year's investment opportunity.

Can I please have the formula as well. Thank you.