Answer: 50 weeks
Step-by-step explanation: If John already has $100 in his bank account and needs $850. You subtract $100 from $850 and get $750. To get how many weeks he needs to get 850, you divide 750 by 15 since john is making 15 per week. 750 divided by 15 equals 50 weeks. So the answer will be 50 weeks till he gets $850.
