12. Country A levies an individual income tax with the following rate structure:

Percentage Rate	Bracket
10%	Income from 0 to $20,000
15	Income from $20,001 to $75,000
25	Income from $75,001 to $160,000
30	Income in excess of $160,000

Refer to Country As rate structure described in the preceding problem. Ms. SPs annual taxable income for years 1 through 5 is $150,000. Ms. OCs taxable income for years 1 through 4 is $20,000. In year 5, Ms. OC wins a lottery, and her taxable income for this 1 year jumps to $670,000.

1. How much total income does each individual earn over the 5-year period?

2. Compute each individuals average tax rate for the 5-year period.