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Calculate discount as a percentage from sale price and discount amount.

`=C2/B2`

Calculate a percentage discount.

`=B2-C2*B2`

Calculate simple interest.

`=A2*B2*C2`

(calculate simple interest)

`=A2+D2`

(amount)

where `A2`

is the Principal

`B2`

is the interest rate as a percentage

`C2`

is the time in years