A trust caring for handicapped children gets 30, 000 rupees every month from its donors. The trust spends half of the funds recieved for medical and educational care of the children and for that it charges 2% of the spent amount from them, and deposits the balance amount in a private bank to get the money multiplied so that in future the trust goes on functioning regularly. What percent of interest should the trust get from the bank to get a total of 1800 rupees every month?
This is a board question of maths-2015 from series SSO.

Use matrix method to find the rate of interest. Do you think people should donate to such trusts?

Here is the link for the answer to a similar query:

It simply depends upon the perception of donors of the organisation, how they perceive the working of such an institution and contribute to the cause.

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