Cheat Corp is a calendar year taxpayer. For the current year it paid $145,000 in est taxes. When the return was completed in February of the current year, the actual tax was $160,000. When is the remaining amount due? a.$15,000 on March 15 b. $15,000 on April 15 c. 7500 on April 15 and 7500 on June 15 d. 7500 on March 15 and 7500 on June 15