Question

1- increased by 10% and then the increased salary was decreased by 10% . find the net increasing or decreasing percent in his original salary.

2- the weight of a boy was 40 kg. but 8t was wrongly measured. as 42kg. find the error percent.

Answer 1

1. Let the original salary be 100$.
10% increase =100+10%of100
100+10
110$
Now, decrease of 10% from this new salary -
110-10%of110
110-11
99$
this new salary is 1% less than original 100$ salary. so net decrease is 1%.

2. Weight was 40 kg. Measured 42 kg. that is plus or minus 2kg. now, error percentage is
(2/40)×100= plus minus 5% error.

Answer 2

hi...
1- let the salary be 100 rs.
increase in salary is 10%
100+ 10% of 100
100+ 10
110 rs.
decrease in salary = 110-10% of 110
110-11
99 rs.
decrease in percentage with respect to his original salary = (difference/ 100) ×100
= 1/100×100
1%