Question

directions: calculate the interest. 1. if briana lends her brother $48, and charges him 15% interest, how much interest will he pay? 2.

Explanation:

Step1: Recall the simple interest formula

The formula for simple interest is \( I = P \times r \), where \( I \) is the interest, \( P \) is the principal amount, and \( r \) is the interest rate (in decimal form).

Step2: Identify the values of \( P \) and \( r \)

Here, the principal amount \( P = \$48 \), and the interest rate \( r = 15\% = 0.15 \) (converting the percentage to a decimal by dividing by 100).

Step3: Calculate the interest

Substitute the values into the formula: \( I = 48 \times 0.15 \).
Calculating this, we get \( I = 7.2 \).

Answer:

The interest he will pay is \(\$7.2\).