Delta Miner just put $30,000 in an investment account for the purpose of buying new equipment three years from today. The company plans on making additional $10,000 per year to the account in the next three years. How much will be available when it is ready to buy the equipment, assuming the account pays 7.5 interest? Select one: O a $69.575 O b. $62,443 Oc. $68,021 Od $66,792 e. $60,000