The beginning balance of a credit card account is $500. the monthly interest rate is 0.012. if a payment of $100 is made on the last day of the month, what is the ending balance?
a. $404.80
b. $406.00
c. $504.80
d. $506.00

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.