A Ponzi scheme Is a fraudulent investment operation In which returns to investors are paid from funds collected from new investors rather than from prot earned by the operator. The scheme takes In: name from the notorious operation of Charles Ponzi In 1920. The case of Bernie Mado Is a more recent example.+ Suppose the operator of a Ponzi scheme pays an Initial return to Investors of $18,000. Each month, he must recruit enough new inveors to increase the return by 4%. (a) Find a formula that gives the return R, in dollars, that the operator must pay after t months. Rm E (b) How much must the operator pay to investors at the end nfa years? (Round your answer to two decimal places.) 94: (c) Assume that new Investors pay $2000 to join the scheme. How many new Investors must he recmited at the end of 3 years In order to pay the existing Investors? (Enter a whole number of new investors.) new Investors