The simple interest on a certain sum at 6% p.a. is Tk. 360 in 1 year. What will be the additional interest earned in 1 year if the rate increases to 7% p.a. on the same sum?
A
Tk. 60
B
Tk. 80
C
Tk. 70
D
Tk. 100
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Solution:
Given,
Interest at 6% for 1 year:
Simple Interest, SI1 = Tk. 360
Interest rate, R = 6%
Time, T = 1 year (initial)
We know,
SI1 = PRT/100
⇒ 360 = (P × 6 × 1)/100
⇒ P = (360 × 100)/6
∴ P = Tk. 6000
So, the original sum (principal) is Tk. 6000.
Now,
Interest at 7% for 1 year:
SI2 = PRT/100
⇒ SI2 = (6000 × 7 × 1)/100
⇒ SI2 = Tk. 420
Additional interest = SI2 - SII
= 420 - 360
= Tk. 60
0
Updated: 2 months ago
In how many years will Tk. 750 amount to Tk. 900 at 4% simple interest per annum?
Created: 2 months ago
A
3.5 years
B
3 years
C
4.5 years
D
5 years
Solution:
Simple Interest = Amount - Principal
= 900 - 750
= 150
Here,
Principal, P = 750
Interest Rate, R = 4%
SI = 150
Time, T = ?
SI = PRT/100
⇒ T = (SI × 100)/(P × R)
= (150 × 100)/(750 × 4)
= 15000/3000
= 5 years
0
Updated: 2 months ago
A shopkeeper marks his goods 40% above the cost price and offers a discount of 20% on the marked price. What is his gain percent?
Created: 3 weeks ago
A
12%
B
17%
C
9%
D
15%
Question: A shopkeeper marks his goods 40% above the cost price and offers a discount of 20% on the marked price. What is his gain percent?
Solution:
Let,
the cost price (CP) be Tk. 100
Marked Price = 40% more than cost price
= 100 + 40
= 140 Tk.
Discount = 20% of 140
= (20/100) × 140
= 28 Tk.
Selling Price (SP)= 140 - 28 = 112 Tk.
∴ Profit = SP - CP = 112 - 100 = 12 Tk.
∴ Gain percent = 12%
0
Updated: 3 weeks ago
Find the simple interest on BDT 12000 at 8% per annum for 6 months.
Created: 3 weeks ago
A
Tk. 480
B
Tk. 560
C
Tk. 400
D
Tk. 420
Question: Find the simple interest on BDT 12000 at 8% per annum for 6 months.
Solution:
Principal, P = 12000 Taka
Time, n = 6 months = 6/12 = 1/2 years
Rate of interest, r = 8% = 8/100
Simple Interest, I = P × n × r
= 12000 × (1/2) × (8/100)
= (12000 × 1 × 8)/(2 × 100)
= 96000/200
= 480
∴ The simple interest is Tk. 480.
0
Updated: 3 weeks ago
