I need help in a problem !

[fawazalusail]

Dave took out a $5500 loan at 18% and eventually repaid $9460 (principal and interest). What was the time period of the loan ?

9460=5500(1+0.18t)

9460=5500+990t

3960=5500+990t

4=t.

What i can't understand is how did we get the 990t ?! Please explain

 

[mmm4444bot]

Dave took out a $5500 loan at 18% and eventually repaid $9460 (principal and interest). What was the time period of the loan ?

9460=5500(1+0.18t)

9460=5500+990t

3960=5500+990t

4=t.

What i can't understand is how did we get the 990t ?! Please explain

It comes from multiplying the two factors shown in red above.

You must memorize The Distributive Property!

A(B + C) = A*B + A*C

5500(1 + 0.18t) = (5500)(1) + (5500)(0.18t)