If the simple interest on $7000 for 4 years is $2520 then what is the interest rate

let

i= Interest

p= Principle

r= rate

t= time

data given

i= $2520

p= $7000

t= 4years

r= ?

From the formula

i= prt

we make 'r' the subject by multiplying by pt both sides

i/pt=prt/pt

i/pt=r

its the same like

r=i/pt

r=$2520/($7000×4)

r=$2520/$28000

r=3/350

r=0.09%

therefore the interest rate is 0.09%

each side has a different length.  

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