40 POINTS URGENT PLEASE HELP
a.) $385
b.) $430
c.) $444
d.) $480

The amount of loan ($20000) after 48 months with 1.5% (0.015) interest rate  is calculated by:

A = 20000 x (1 + 0.015/12)^48

   = 21235.94$

Monthly payment of Grace is calculated by:

M = A/number of month

   = 21235.94/48 = 442.4 = ~444$

Hope this helps!

:)

P.S: I did try the amortization formula, but something wrong with my calculator. I used other formula instead :)

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.