Equations!!

Tina is saving to buy a notebook computer. She has two options. The first option is to put $400 away
initially and save $20 every month. The second option is to put $200 away initially and save $40 every
month. After how many months would Tina save the same amount using either option? How much
would she save with either option?

After
months,___ Tina will save $
with either option___