"This year Henry will save a certain amount of his income, and he will spend the rest. Next year Henry will have no income, but for each dollar that he saves this year, he will have 1 + r dollars available to spend. In terms of r, what fraction of his income should Henry save this year so that next year the amount he has available to spend will be equal to half the amount that he spends this year?"
a) 1 / (r+2)
b) 1 / (2r + 2)
c) 1 / (3r+2)
d) 1 / (r +3)
e) 1 / (2r+3)
OA: E
After looking at the solution, I somewhat understand what they're doing via pure algebra and manipulation. I am just wondering if there is a easier/faster way to plug/guess&check within 2 minutes.
a) 1 / (r+2)
b) 1 / (2r + 2)
c) 1 / (3r+2)
d) 1 / (r +3)
e) 1 / (2r+3)
OA: E
After looking at the solution, I somewhat understand what they're doing via pure algebra and manipulation. I am just wondering if there is a easier/faster way to plug/guess&check within 2 minutes.
