Question 885356
a = p(1+r)^2
a = 228980
p = 200000
replace a and p in the equation to get:
228980 = 200000(1+r)^2
divide both sides by 200000 to get:
228980/200000 = (1+r)^2
simplify to get:
1.14449 = (1+r)^2
take the square root of both sides to get:
1.07 = 1+r
subtract 1 from both sides to get:
r = .07
the rate she needs to invest her money at is 7%.