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.