Final answer:
The petty cash vouchers should total $65 on January 18.
Step-by-step explanation:
To find out how much the petty cash vouchers should total on January 18, we need to calculate the total amount of money that was spent from the petty cash account.
Starting with a balance of $150 on January 1 and a balance of $85 on January 18, we can subtract the ending balance from the beginning balance: $150 - $85 = $65
Therefore, the petty cash vouchers should total $65 on January 18, which is option B.