A proposed change in income tax suggests charging 25% on a person's income up to $42,000 and then 40% on any income above that. If a person has an income of $68,000, what will their income tax be under the proposal?

The bottom of ignacio's desktop is 74.5cm from the floor. ignacios sits in his adjustable chair, and the tops of his legs are 49.3cm from the floor. each clockwise rotation of the knob on the chair raises ignacio's legs by 4.8cm. write an inequality to determine the number of clockwise rotations, r, ignacio could make with the knob without his legs touching the desk.