oupagIn started. 8000 blood donors ...
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oupagIn started. 8000 blood donors were registered with a charitable hospital. Some student organizations started mobilizing people for this noble cause. As a result, the number of donors registered, increased at the rate of 20% per half year. Find the total number of new registrants during 15 years.

11th - 12th Class
Maths
Solution
393
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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 mathrm{yr})=20 / 100 times 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 times 9600 ) ( =1600+1920 ) ( =3520 ) Total no. of registrations after 1 year ( =3520+8000 ) ( =11520 ) The no. of new registrations after ( 11 / 2 ) years ( =3520+20 / 100 times 11520 ) ( =3520+2304 ) ( =5824 ) Therefore, the no. of new registrations after ( 11 / 2 ) years ( =5824 )
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