Rakesh credits 15% of his salary in his fixed deposit account and spend 30% of the remaining amount on groceries. If the cash in hand is Rs. 2380, What is this salary?

CP of the chair which is sold at 25% of profit = Rs 4000/ (1+ 25%)
= Rs 4000/1.25
= Rs 3200

Now given, that sum of CP pf table and chair= sum of SP of table and Chair
? 8000= 3200 + CP of Table
? CP of Table = Rs 4800
? Loss on Cost price of table = Rs 4800- Rs 4000= Rs 8000
? Loss % = 8000/4800 = 16.66%

10% of 100 = 10
New price = 110

Again, 10% of 110 = 110 x (10/100) = 11
New price = 110 + 11 = 121

? Required increment = 121 - 100 = 21

Given, a = 20%
Required percentage = [a/(100 - a)] x 100%
= [20/(100 - 20)] x 100%
= (20/80) x 100%
= 25%

Saving = 20%
Expenditure = 80% = ?6000

Since 80% is 6000 so 20% would be 6000/4 = ?1500
Hence net saving per month = ?1500

Total marks obtained = (76 + 48 + 84 + 38 + 72) = 318
Maximum marks = 5 x 100 = 500
? Requirred percentage = (318/500) x 100 % = 63.6 %

Let his income be Rs. N, then N - 5% of N - 20% of 95% of N = 1919
? N - N/20 - (20 x 95 x N)/(100 x 100) = 1919
? N - N/20 - 19N/100 = 1919
? 100N - 5N - 9N = 191900
? N = 191900 / 76 = 2525

? 137¹/₂% of N = 33
? {(275/2) x N} / 100 = 33
? N = (33 x 2 x 100) / 275 = 24

? 72¹/₂% of N = 87
? {(145/2) x N} / 100 = 87
? N = (87 x 2 x 100) / 145 = 120

Let third number be N
Then, first number = 70% of N = 7N/10 and,
Second number = 63% of N = 63N/100
Difference = 7N/10 - 63N/100 = 7N/100
? Required percentage = (7N/100) x (10/7N) x 100 % = 10%

? (62% of N - 38% of N) =144
? 24% of N = 144
? N = (144 x 100)/24 = 600