You are offered a dog-walking job with a total of 20 hours (40 half-hour walks). You
could be paid $5.75/h for 20 h, or $3.25 for the first hour, $3.50 for the second hour,
$3.75 for the third hour, and so on, to 20 h.

a. Which option pays more?
b.how much more does it pay?