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Answers
Solutions!!
(5) (i)
Interest = Rs 3500
Time (T) = 5 years
Rate of interest (R) = 14%
Principal (P) = ?
→ P = (Interest × 100) ÷ (Rate of interest × Time)
P = (3500 × 100) ÷ (14 × 5)
P = 350000 ÷ 70
P = Rs 5000
(ii)
Interest = Rs 2304
Time (T) = 4 years
Rate of interest (R) = 12%
Principal (P) = ?
→ P = (Interest × 100) ÷ (Rate of interest × Time)
P = (2304 × 100) ÷ (12 × 4)
P = 230400 ÷ 48
P = Rs 4800
(iii)
Interest = Rs 1650
Time (T) = 3 years
Rate of interest (R) = 10%
Principal (P) = ?
→ P = (Interest × 100) ÷ (Rate of interest × Time)
P = (1650 × 100) ÷ (10 × 3)
P = 165000 ÷ 30
P = Rs 5500
(6) (i)
Principal (P) = Rs 1500
Interest = Rs 16.50
Rate of interest (R) = 5.5%
Time (T) = ?
→ T = (Interest × 100) ÷ (Principal × Rate of interest)
T = (16.50 × 100) ÷ (1500 × 5.5)
T = 1650 ÷ 8250
T = 0.2 years
(ii)
Principal (P) = Rs 3800
Interest = Rs 60.80
Rate of interest (R) = 4%
Time (T) = ?
→ T = (Interest × 100) ÷ (Principal × Rate of interest)
T = (60.80 × 100) ÷ (3800 × 4)
T = 6080 ÷ 15200
T = 0.4 years
(7)
Principal (P) = Rs 6000
Interest = Rs 360
Rate of interest (R) = 15%
Time (T) = ?
→ T = (Interest × 100) ÷ (Principal × Rate of interest)
T = (360 × 100) ÷ (6000 × 15)
T = 36000 ÷ 90000
T = 0.4 years
1 year = 365 days
0.4 years = 0.4 × 365 days
0.4 years = 146 days
Time (T) = 146 days
(8)
Principal (P) = Rs 4500
Interest = Rs 540
Time (T) = 1 year
Rate of interest (R) = ?
→ R = (Interest × 100) ÷ (Principal × Time)
R = (540 × 100) ÷ (4500 × 1)
R = 54000 ÷ 4500
R = 12%
(9)
Interest = Rs 17355
Time (T) = 1 year
Rate of interest (R) = 15%
Principal (P) = ?
→ P = (Interest × 100) ÷ (Rate of interest × Time)
P = (17355 × 100) ÷ (15 × 1)
P = 1735500 ÷ 15
P = Rs 115700