Interest = Principal (P) × Rate (R) × Time (T)
Where:
P (Principal) is the initial deposit amount: $7,500
R (Rate) is the annual interest rate: 2.7% (0.027 as a decimal)
T (Time) is the number of years: 4
Plug these values into the formula:
Interest = $7,500 × 0.027 × 4
Interest = $7,500 × 0.108
Interest = $810
So, Julia will have earned a total interest of $810 at the end of the 4 years.