A grocery store buys items and then applies a markup of 75%. What is the retail price of item that originally costs $5.40

$9.45

Step-by-step explanation:

$5.40 × 75% = 4.05

$5.40 + $4.05 = 9.45

Principal amount of loan taken by a student = $1500
Rate of interest charged by the college = 5.39%
Time for which the loan was taken = 2 years
Then
Interest = Principal * Rate of interest * Time
             = 1500 * 5.39% * 2
             = 1500 * (5.39/100) * 2
             = 15 * 5.39 * 2
             = 161.70 dollars
So the amount of interest that the student needs to pay is $161.70.I hope the procedure is clear enough for you to understand.