r= - 50
n=12
Sn=8700
S₁₂=[2a₁+(n-1)r]/2 ×n
8700=[2a₁+(12-1)× -50]/2 ×12 /×2
17 400=[2a₁-550]×12 /:12
1450=2a₁-550
2a₁=1450+550
a₁=2000:2=1000zł= 1 rata
a₁₂=a₁+11r=1000+11×(-50)=1000-550=450zł= ostatnia rata
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r= - 50
n=12
Sn=8700
S₁₂=[2a₁+(n-1)r]/2 ×n
8700=[2a₁+(12-1)× -50]/2 ×12 /×2
17 400=[2a₁-550]×12 /:12
1450=2a₁-550
2a₁=1450+550
a₁=2000:2=1000zł= 1 rata
a₁₂=a₁+11r=1000+11×(-50)=1000-550=450zł= ostatnia rata