Mark earned some money doing odd jobs last summer and put it in a savings account that earns 2% interest compounded quarterly. after 5 years, there is $300.00 in the account. how much did mark earn doing odd jobs?

Here we will use the formula of compound interest which is as follows:

Where,

A=amount

P=principal

r=rate of interest

n=number of times interest is compounded in a year

t=time

We are given,

r=2% or 0.02

t= 5 years

n =4( compounded quarterly)

A= $300

Let us plug these in the formula to find Principal

Principal = $271.49

Mark earned $271.49 during odd jobs.

30.5*10=350$

you have to multiply the number without the decimal point then add it later but if its tenn u must move the place value of the decimal point 1 to the right.