1. Find the simple interest paid on the following principal
sums P, deposited in a savings account for years at a fixed
rate of interest of r%:
a) P = $550
t = 5 years
r = 3%



Answer :

Sure, let's calculate the simple interest step by step.

The formula to calculate simple interest is:

[tex]\[ I = \frac{P \times r \times t}{100} \][/tex]

where:
- [tex]\( I \)[/tex] is the simple interest,
- [tex]\( P \)[/tex] is the principal amount,
- [tex]\( r \)[/tex] is the annual interest rate in percentage,
- [tex]\( t \)[/tex] is the time period in years.

Given:
- [tex]\( P = 550 \)[/tex] dollars,
- [tex]\( t = 5 \)[/tex] years,
- [tex]\( r = 3 \)[/tex]%,

we can plug these values into the formula:

[tex]\[ I = \frac{550 \times 3 \times 5}{100} \][/tex]

Calculating the above step-by-step:

1. Multiply the principal amount ([tex]\( P \)[/tex]) by the interest rate ([tex]\( r \)[/tex]):
[tex]\[ 550 \times 3 = 1650 \][/tex]

2. Multiply the result by the number of years ([tex]\( t \)[/tex]):
[tex]\[ 1650 \times 5 = 8250 \][/tex]

3. Divide by 100 to get the simple interest:
[tex]\[ \frac{8250}{100} = 82.5 \][/tex]

So, the simple interest paid on the principal sum of \[tex]$550, deposited for 5 years at an interest rate of 3%, is \$[/tex]82.50.