Answer:
8
Explanation:
1300 - 500 = 800
800 / 100 = 8
So Craigs son is 8 years old
$1300 - $500 = $800
He put in $100 on
1st birthday = $600
2nd birthday = $700,
3rd = 800
4th = 900
5th = 1000
6th = 1100
7th = 1200
8th = 1300
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