$396,800
First, you want to know how many times it'll double in value. So you figure out 78/13 which you'll end up with 6.
Then you'll want to multiply 6,200*2, as that would be doubling it. You'll want to take your answer and repeat until you've done it a total of six times. Your answer should be $396,800. (Please give me Brainliest!)