Johann borrows money from his parents to purchase a bike. he makes weekly payments to his parents to repay the money borrowed. the total amount of money repaid at the end of week n can be represented using the recursive formula an=10 + an-1 . at the end of the fourth week, johann had repaid his parents a total of $55. what is the total amount johann has repaid his parents at the end of the first week?

a.)$10
b.)$20
c.)$25
d.)$35