Question

8000 blood donors were registered with the charitable hospital. some student organise istarting mobilizing people for this noble cause as a result the number of donors registered increases at the rate of 10% per half year find the total number of new registration during 1 whole 1 /2 years​

Answer 1

Answer:

No. of donors registered = 8000

rate of increase of no. of donors per half year = 20%

So the no. of new registrations after 6 months (1/2 yr) = 20/100 × 8000

=1600

The total no. of registrations after 1/2 year = 1600+8000

=9600

Then the no. of new registrations after 1 year = 1600 + 20/100 × 9600

= 1600 + 1920

=3520

Total no. of registrations after 1 year = 3520+8000

=11520

The no. of new registrations after 1 1/2 years = 3520+20/100×11520

=3520+2304

=5824

Therefore, the no. of new registrations after 1 1/2 years = 5824

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