Answer:
11 yrs and 28 weaks
Explanation:
1. Let w=week; n=Yrs
As we know that n = 52*w
2. let S1 be the saving of 1 week and S2 will be saving of yr. so
S2 = 52xS1
S2 = 260 $ = n
if S3 is Total Savings then
3. S3= 260 x 10 + 400
S3= 10 x S2 + 1 x S2 + 140
S3 = 11 x (n) + 28 x (w)
where n = 260 $ ; w = 5 $
4. So 11 yrs and 28 weeks will take to save 3000 $