Percentage quiz 1

If the paper rate increases at 1.5% more than the inflation
rate which is 6.5%
This means paper rate increase is 1.5+6.5 = 8% per year
For the first year the increase is 8 % or (8/100)x25 = 2
So the new cost is 25+2 = 27
For the second year the increase is the same = (8/100)x27 = 2.16
So the cost = 27+2.16 = 29.16

A:B=3:2
A s share=855 so, B s share= 2/3 0f 855=570
total a+b share = 855+570=1425
and it 95% of the profit as 5% goes to charity
hence total profit was 1425*100/95= 1500

61.53%
Contribution by 30% @ 40$ each= 30*40=1200
Contribution by 45% @ 10$ each= 45*10=450
Contribution by rest 25% @12$ each= 25*12= 300
% of total contribution came from the people who gave
40$= 100*1200/(1200+450+300)= 2400/39 =61.53 approx 62%

people ate either type of lunch = A union B = 60+30-15= 75%
people did not eat either type of lunch = 25%
so
96*25%=24

total failed=34+42=76
again 2o of them failed...so 76-20=56.
so totally 56 failed..and remaining 44 are passed .
so 44 is the answer

Consider the third no. as 100, and so the first two no.s are 70 and 63.
now the second no. is less than the first no. by 7
so
the second no. is (7/70)*100% = 10% less than the first no.

Increase by 10% & decrease by 10% means there is a loss of 1%
totally. That loss in 1% percent is added to Rs. 2178 to get
actual price.
1% of 2178=21.78
2178+21.78=2199.78(=2200 appro)

Video solution:

s1*t=s2*3/4t
s2=s1*4/3
increase=change*100/original
=(s2-s1)*100/s1
=33.3%

3 boundries and 8 sixes=3*4+8*6=60
so,total runs make by running between the wickets is 110-60=50
so,percentage is (50/110)*100 %=45.45 %
ans (b)