The following data are for a series of increasingly extensive flood control projects:
Total cost Total benefit per year per year
Plan A levees $10,000 $16,000
Plan B small reservoir 24,000 36,000
Plan C medium reservoir 44,000 52,000
Plan D large reservoir 72,000 64,000
Refer to the data. For Plan D marginal costs and marginal benefits are:. a. $72,000 and $64,000 respectively. b. $28,000 and $12,000 respectively .c. $24,000 and $18,000 respectively. d. $16,000 and $28,000 respectively.

Secured loans are protected by collateral security. examples: title loans where the borrower uses the car title as collateral security interest rates are lower and repayments are longer therefore risk is low as a collateral security is given as guarantee to the bank in case of failure to pay the loanunsecured loans are not protected by collateral security but it is given on the creditworthiness of the borrower, trusting that she/he will pay on time. examples; payday loans is a short term loan where the borrower lends money from the bank and pays is back when the borrower receives his/her wages.interest rates are high and repayments are shorter. but the risk is high as no collateral security is given as a guarantee to the bank for payment of the loan