Answer
B
Explanation
Look for a 9 on the y axis then do Y2-Y1/X2-X1 with any 2 plots on the table
The annual interest rate is 3.5%.
Solution:
Given Interest (I) = $26.25
Principal (P) = $500
Time (t) = 18 months
Rate of interest (r) = ?
Time must be in years to find the rate per annum.
1 year = 12 months
Divide the time by 12.
Time (t) =
years
Now, find the rate of interest using simple interest formula.
<u>Simple interest formula:</u>






⇒ r = 3.5%
Hence the annual interest rate is 3.5%.
1/2 because 25 ÷ 25 = 1 and 50 ÷ 25 = 2