A company had 60 units of inventory at a cost of $15 each on January 1. On March 25, the company purchased 40 units for $17 each. On July 10, the company purchased 20 units for $18 each. Given this information, determine the weighted average unit cost under the periodic inventory method. (Do not round your intermediate calculations; round the final answer to nearest whole cent.)

$16.67

$17.00

$16.17

$18.00

$15.00