answer question in the pic
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1st birthday =0+100
2nd birthday=100+200=300
3rd birthday=300+300=600
4th birthday=600+400=1000
5th birthday=1000+500=1500
6th birthday=1500+600=2100
7th birthday=2100+700=2800
8th birthday=2800+800=3600
9th birthday=3600+900=4500
10th birthday=4500+1000=5500
11th birthday=5500+1100=6600
12th birthday=6600+1200=7800
13th birthday=7800+1300=9100
14th birthday=9100+1400=10500
15th birthday=10500+1500=12000
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