Consider the following exam question and student solution. determine whether the solution is correct. if it is not correct, write a note to the student explaining why it is wrong and give a correct solution.

exam question: you can buy a 32
-pound
bag of flour for $9

or you can buy a 1-pound bag for  $0.45
.
compare the per pound cost for the large and small bags.

student solution: the large bag price is 32
divided by $9equals$3.56
per pound, which is much more than the 45 cents

per pound price of the small bag.

See explanation

Step-by-step explanation:

Large bag:

You can buy a 32-pound bag of flour for $9, then 1 pound costs

Small bag:

You can buy a 1-pound bag for $0.45.

Compare:

the large bag price is less than the small bag price.

Mistake:

Student apllied incorrect division: instead of dividing the price by the number of pounds, he divided the number of pounds by the price (this gives him the amount of pounds per one dollar)

answer: the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

step-by-step explanation:

the given rate of interest i= 85%

in calculating the monthly payment for a loan with an interest rate compounded monthly, the value of the interest rate per period we use in the formula must be in decimal form.

to convert it in decimal, we divide it by 100, we get

hence, the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.