Percentage of a Quantity

Percentage of a Quantity

Find the no of male students (i.e boys), if there are 42% male students in the school and the total no. of students in the school is 1000.

Solution:

Required number of male students

                                = 42% of 1000

                               = 42/100 x 1000 = 420

A student scored 85% marks. Total marks were 400. How much did he score?

Solution:

Mark scored = 85% of 400

                    = 85/100 x 400

                    = 340


In an orchard 16 2/3% of the trees are mango trees. If the total number of trees in the orchard is 360, find the number of other types of trees in the orchard.

Solution:

Total number of trees = 360

Number of mango trees = 16 2/3% of 360

                                      = 50/3x100 x 360 = 60

Therefore, the number of other trees = 360-60 = 300

Alternatively: 

Number of mango trees = 16 2/3%

It means no. of other types of trees = (100 - 16 2/3)%

                                                       = 83 1/3%

Thus number of other types of trees = 83 1/3% of 360 = 300


Arun purchased 80 meters of cloth, out of which 35% was used for making trousers. How much cloth was used by her for making trousers?

Solution:

               = 80 x 35/100 = 28 meter

Aruna's monthly salary was rs.1140. Her salary is increased by 16.66%. How much increase has she gotten? Also find the salary if her salary increased by 33.33%.

Solution:

                      = 1140 x 16.66/100 = 190

                         = 1140 x 33.33/100 = 379.962  

                         = 1140 + 379.962 = 1520

A Shopkeeper announces a reduction of 8.33% on all its prices after new year. If a wrist watch was earlier for rs.2400. How much would it costs now?

Solution:

= 2400 x 8.33% = 199.92

= 2400-200 = 2200rs