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melodeelathrom
29.12.2019 •
Mathematics
Aman borrows rs. 1000/- and agrees to repay the sum with a total interest of
rs. 140/- in 10 installments. each installment being less than the preceding
installment by rs. 10/- . what should be the 1st installment?
plzz answer in detailed
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Ответ:
Rs 159
Step-by-step explanation:
1000+140 = 1140
let first installment be a
second will be a-10, third will be a-20
hence we have
a+(a-10)+(a-20)+10 TERMS
CLEARLY THIS IS AN ARITHMETIC PROGRESSION
Sn = (n/2){2a+(n-1)d}
here Sn = 1140 n = 10 , d = a-10-a = -10
1140 = (10/2){2a +(10-1)(-10)}
1140= 5{2a+(9)(-10)}
1140= 5{2a-90}
5{2a-90} = 1140
2a-90 = 1140/5
2a-90 = 228
2a = 228+90
2a = 318
a = 318/2
a= 159
Ответ:
perpendicular to the line connecting the two stakes and going through the midpoint of the two stakes
Step-by-step explanation: