120-(120*20%) = 120-24 = 96
Natasha paid $96.
0.8p represents how much the price was when Natasha paid.
2p+6a=$14
3p+9a=$21
3p+9a=21
Subtract 9a
3p=21-9a
divide all by 3
p=7-3a
plug it into start equations
2p+6a=14
2(7-3a)+6a=14
14-6a....+6a=14
this zeroes out...
Year 1
58054.76=63,103(1-r)^1
Year 2
53,410.38=63103(1-r)^2
Ok but allow my humble self to use instead of .
We have,
If you wanna know what the inverse is swap the values of x and y,
And now solve for y,
.
Hope this helps.