1. Find Interest Rate i = ?
Present value C = 1000, Time n = 3 Year, Future value FV = 1300,
for Future value using Simple Interest method

Solution:
`C=1000`

`n=3` years (Number of periods)

`FV=1300` (Future value)

Now, Future value (Simple Interest) formula is
`FV=C*(1+i*n)`

`:.1300=1000*(1+i*3)`

`:.(1300)/(1000)=(1+i*3)`

`:.1.3=1+i*3`

`:.1.3-1=i*3`

`:.0.3=i*3`

`:.0.3/3=i`

`:.i=0.1`

`:.i=10 %` per year

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2. Find Interest Rate i = ?
Present value C = 5000, Time n = 2 Year, Future value FV = 6000,
for Future value using Simple Interest method

Solution:
`C=5000`

`n=2` years (Number of periods)

`FV=6000` (Future value)

Now, Future value (Simple Interest) formula is
`FV=C*(1+i*n)`

`:.6000=5000*(1+i*2)`

`:.(6000)/(5000)=(1+i*2)`

`:.1.2=1+i*2`

`:.1.2-1=i*2`

`:.0.2=i*2`

`:.0.2/2=i`

`:.i=0.1`

`:.i=10 %` per year

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