Answer:
On the first day of July he will need to have saved $4098 for his new car.
Explanation:
So we know that on March he save $16 and the amount he needs to save each month increases by 4 times the previous month’s amount.
We can conclude then for April he would need to have saved $64.
In May, if we repeat the pattern of multiplying the previous month’s savings by 4, Warren would have saved $256.
We will continue this pattern for June and July.
In July we will multiply $1024 (total saved in June) by 4 to find that in July, Warren will have needed to save $4098
Hope this helps you out :)