Instalment Buying — Formula Sheet
NIOS · Class 10 · Maths
7 formulas from Instalment Buying (NIOS Class 10 Maths) on one page, grouped by topic. Part of the NIOS Class 10 Maths syllabus.
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Formulas and Key Relations
Simple Interest Method for Monthly Instalments
Total Principal × (r/100) × (1/12) = Interest paid
Principal of instalment paid after T months = (Instalment × 1200)/(1200 + rT)
Total principal = n × Balance − x(0+1+2+...+(n−1))
Compound Interest Method for Instalments
P_k = x(100/(100+R))^k, Σ(P_k) = Balance
P_k = x(100/(100+R/2))^k
P_k = x(100/(100+R/4))^k
Finding Cash Price
Principal = (Instalment × 1200)/(1200 + rT)
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