Once you thoroughly understand dimensional analysis, you can do problems such as
this one without the need to write out each step individually, as shown below.
3 boxes \times \frac{30 \text{ rolls}}{1 \text{ box}} \times \frac{25 \text{ nickels}}{1 \text{ roll}} \times \frac{1 \text{ dollar}}{20 \text{ nickels}} = 3 \times 30 \times 25 \div 20 = 112.50 \text{ dollars}
c. Use dimensional analysis to solve the following problem. Show your process and how
you cancel the units.
A farmer planted 75 acres of wheat. He expects to harvest 35 bushels per acre and, for
each three bushels, he hopes to be paid $20. What are his total anticipated earnings?
