Jones of boston borrowed $40,000, on a 90-day 10% note. after 60 days, jones made an initial payment of $6,000. on day 80, jones made an additional payment of $7,000. assuming the u. s. rule, what's the adjusted balance of the first payment? (use 360 days.) a. $34,666.67 b. $49,666.67 c. $54,696.67 d. $56,696.67