Year # of New Bulbs # aged 1 # aged 2
0 2500
1 2500*.2=500 2500*.8=2000
2 .2*500=100 .8*500=400 .75*2000=1500
+ .25*2000=500
3 .2*600=120
+ .25*400=100
+ .5*1500=750
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970
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