Reena got 76 marks in Hindi, 48 marks in science, 84 marks in Mathematics, 38 marks in Social Science and 72 marks in English. The Maximum marks of each subjects was 100. How much over all percentage of marks she got?

Let the maximum marks be N .
According to the question,
Then, 780 - 728 = 5% of N
? 52 = 5% of N
? N = 5200/5 = 1040

III     II       I   
100 150 120
Required percentage = (150/120) x 100% = 125%

According to the question,
Change in length of rectangle = - 50% = a
Change in breadth of rectangle = 100% = b
Net effect = a + b + (ab)/100 %
= - 50 + 100 + [(-50) (100) / 100]%
= 0%

32%of 3/8 of 5000 = (32/100) x (3/8) x 5000
= 4 x 3 x 50 = 600

Required percentage = (50/250) x 100% = 20%

Saving = 20%
Expenditure = 80% = ?6000

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

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

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

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%

Let salary be Rs. A, then A - 15 % of A - 30% of 85% of A = 2380
? A - 15A/100 - (30 x 85 x A)/(100 x 100) = 2380
? 200A - 30A - 51A = 2380 x 200
? 119A = 2380 x 200
? A = (2380 x 200)/199 = 4000