I need it withing 30 minutes. I would appreciate if you could do it fast

Hyakuen Inc. is a Japanese firm located in Nagoya. The firm sells merchandise on account for JPY 5,000,000 to Katakana Inc with credit terms of 2/10,n/30. Katakana Inc. returns JPY 1,000,000 of merchandise that was damaged, along with a check to settle the account within the discount period. Calculate the amount of Katakana Inc.'s check! Select one: a. JPY 3,920,000 b. JPY4,920,000 c. JPY 4,000,000 d. JPY 4,900,000