Consumers usually save the most money on major purchases when they

agree to an installment plan.
save up to pay with cash.
take out a low-interest loan.
agree to rent to own.

save up to pay with cash.

When consumers save up and pay something with cash, their responsibilities towards the seller end immediately. However, in any other situation, the buyer remains tied to the seller (or the bank) until the full amount has been paid. This often leads to the buyer spending much more than he intended. It also leaves him vulnerable to extra charges such as interests.

the answer is

r ≈5.641

plug in the area of 100 yards into the equation

100=

divide each side by pi

≈ 31.8309=

take the square root of each side to find r

=r

r ≈5.641

sorry answered wrong answer