John invested $30000 in the bank for 4 years. At the end of the period, he had $42520. Calculate
a. the interest earned
b. the rate per annum at which simple interest was earned to 1 decimal place.

Rate = 10.4%

Step-by-step explanation:

Given :

P = $30000

A = $42520

Interest earned = 42520 - 30000 = $12520

Time = 4years

Find R

Round to 1 decimal place, Rate = 10.4%

dd

step-by-step explanation:

dd

2 and 1.

step-by-step explanation:

plug in each answer. 0 doesn't work, 1 does. so does 2. 4 doesn't:

0 = 1 is not true.

2 = 2 is true.

4 = 4 is true.

8 = 16 is not true.

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