Question

A school has raised 75% of the amount it needs
for a new building by receivirg an average
donation of RS 1200 from the parents of the
studentsThe people already solicited
represents the parents of 60% of the students.
If the School is to raise exactly the amount
needed for the new building, what should be​

Answer 1

Answer: 80% of the parents would be needed.

Step-by-step explanation:

The school has already attained Rs. 1200, which is 75% of what it needs. So because we want to know how much exactly is needed, we would equate with 100%

75% = 1200

100%?

We cross multiply ;

(100 × 1200) ÷ 75 = 1600

The school needs a total of Rs. 1600

This Rs. 1200 was what 60% of the parents donated. So what percent of the parents would donate the full amount?

We equate;

1200 = 60%

1600?

(1600 × 60) ÷ 1200

This gives you 80%

80% of the parents would be needed to raise the exact amount the school needs go the building