Successive discount of 20% and 15% are equal to a single discount of-
A
30%
B
32%
C
34%
D
35%
উত্তরের বিবরণ
Question: Successive discount of 20% and 15% are equal to a single discount of-
Solution:
Let, The original price be 100 tk
After a 20% discount, the price is = 100 - 20 = 80 tk
Again, after a 15% discount, the new price is = 80 - {80 × (15/100)}
= 80 - 12
= 68
∴ Total discount= (100 - 68) = 32%
0
Updated: 1 month ago
What is the compound amount of Tk. 3200 for 2 years at a rate of interest 5% per annum?
Created: 1 month ago
A
Tk. 3500
B
Tk. 3528
C
Tk. 3640
D
Tk. 3568
Solution:
Given,
Principal, P = 3200
Rate, r = 5% = 5/100 = 1/20
Time, n = 2 years
We know,
A = P(1 + r)n
= 3200 × (1 + 1/20)2
= 3200 × (21/20)2
= (3200 × 21 × 21) / (20 × 20)
= (3200 × 441) / 400
= 1411200 / 400
= 3528
∴ The compound amount is Tk. 3528.
0
Updated: 1 month ago
চালের দাম ২৫% বেড়ে যাওয়ায় এক ব্যক্তি চালের ব্যবহার এমন ভাবে কমালেন যেন তাঁর বাৎসরিক ব্যয় অপরিবর্তিত থাকে। তিনি চালের ব্যবহার শতকরা কত ভাগ কমালেন?
Created: 4 months ago
A
১৮%
B
২০%
C
২৫%
D
১৫%
দাম বাড়লে, ব্যয় অপরিবর্তিত রাখতে ব্যবহার কমাতে হয়:
এখানে,
0
Updated: 4 months ago
Two numbers P and Q are such that the sum of 10% of P and 15% of Q is three-fourths of the sum of 20% of P and 18% of Q. Find the ratio of P : Q.
Created: 2 weeks ago
A
10 : 3
B
3 : 7
C
5 : 12
D
3 : 10
Question: Two numbers P and Q are such that the sum of 10% of P and 15% of Q is three-fourths of the sum of 20% of P and 18% of Q. Find the ratio of P : Q.
Solution:
10% of P + 15% of Q = 3/4 × (20% of P + 18% of Q)
⇒ 10P/100 + 15Q/100 = 3/4 × (20P/100 + 18Q/100)
⇒ P/10 + 3Q/20 = 3/4 × (P/5 + 9Q/50)
⇒ 2P/20 + 3Q/20 = 3/4 × (10P + 9Q)/50
⇒ (2P + 3Q)/20 = (30P + 27Q)/200
⇒ 10(2P + 3Q) = 30P + 27Q
⇒ 20P + 30Q = 30P + 27Q
⇒ 30Q - 27Q = 30P - 20P
⇒ 3Q = 10P
⇒ P/Q = 3/10
∴ P : Q = 3 : 10
0
Updated: 2 weeks ago
