Task 4.

Georgy Semenovich decided to take a loan from a banking institution in the amount of 7,500,000 rubles to purchase a studio in Bdensk. The loan terms are as follows: he returns the initial loan amount and 450,000 rubles in interest over 20 months. Determine the annual interest rate of the banking institution on the loan (in percent), assuming the duration of the year is 360 days, and the number of days in a month is 30.
Solution: (450000/20)/7500000*12*100

Answer: $3.6 \%$

Criteria:

Correct solution and answer - 20 points