A person's salary has increased from? 7200 to ? 8100. What is the percentage increased in his salary?.

Let the number be N,
Then, 137.5% of N = 33
? N = (33 x 100)/137.5 = 24

Given, P = 15, Q = 20 and R = 25
According to the formula
R% of A = [(QR)/P]% of B
25% of A = (20 x 25)/15 % of B
= 100/3 % of B
= 33¹/₃ % of B

89% of ? + 365 = 1075.22
? (89/100) x ? = 1075.22 - 365
? ? = 71022/89 = 798

20% of N =90
? N x (20/100) = 90
? N = 90 x 5 = 450

5% of 50% of 500
= (5/100) x (50/100) x 500
= 12.5

Given, A = 5B/6
Let Income of B = N
? A = 5N/6
Required percentage = [(N - 5N/6) / (5N/6)] x 100
= [(6N - 5N)/5N] x 100
= (1/5) x 100 = 20%

Let the required amount of money be N.
Then, N x 25% = 180 x 12¹/₂%
? N = (180 x 12.5)/25
= ? 90

Let N be the number
Then, 30% of N = 190.8
? N = (190.8 x 100)/30 = 636
? 125% of 636 = (125 / 100) x 636 = 795

Monthly income of a person = ? 5000
Increment in income = (30/100) x 5000 = 1500
New income = 5000 + 15000 = ? 6500

Let the number be N.
Then N - 35 = 80N/100
? N - 4N/5 = 35
? N / 5 = 35
? N = 175

? Required number = 175 x (4/5)
= 35 x 4 = 140