In june, cory begins to save money for a video game and a tv he wants to buy in december. he starts with $20. each month he plans to save 10% more than the previous month. how much money will he have at the end of december?

Given the situation above, Cory wants to save money for a video game and a TV  which he wants to buy in December. In June, he starts with $20 and adds up 10% more than the previous month. This will be the solution:
Given: June $20
July $20 x .10 = $2 + $20 = $22
August $22 x .10 = $2.2 + $22 = $24.2
September $24.2 x .10 = $ 2.42 + $ 24.2 = $26.62
October $26.62 x .10 = $2.662 + $26.62 = $29.28
November $ 29.28 x .10 = $ 2.93 + 29.28 = $ 32. 21
December $32.21 x .10 = $3.221 + $32.21 = $35.43
Lastly, add up all the monthly savings he had.
20 + 22 + 24.2 + 26.62 + 29.28 + 32.21 + 35.43 = $189.74
Cory will have a total of $189.74 by december.