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%

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!