Duey doesn't know how to calculate tax and delivery fees

Description of the bug: (optional screenshot/video):
Sometimes whenever you are lazy to chase after people that you owe money to, the best way to do is to send money is through Duey. Duey miscalculates the amount of money he promises to tax you.
What is supposed to happen?: He is supposed to show the correct amount.
Where did you find and/or notice this bug?: Whenever you utilize Duey the Package Delivery's services.
A step-by-step guide to re-producing this bug (optional):
For the purposes of this demonstration, I decided to send 200k to my friend. Since I know that Duey taxes you (the sender) 2.5% and then subtracts 5,000 mesos as his delivery fee, I decided to calculate the amount I should send to account for the tax. The calculations for that would be the following: (200,000 - 5000)/1.025 = 190,243 mesos.
If you look at the following picture (https://imgur.com/a/bDs0KuW), you'll see that Duey claims he taxes you 6902 mesos for the amount I want to send. This would amount to a total of 197,145 mesos deducted in the transaction. This is clearly incorrect as the two pictures below show the before and after amount:
- Before: https://imgur.com/a/NZq8aC3
- After: https://imgur.com/a/QbZjbSA
From the picture, you can see that 199,999 Mesos was deducted from the transaction, as it went from 184,813,187 mesos to 184,613,188 mesos.

To all of you reading this post, I hope you haven't gotten scammed by Duey's quoted amount for his transportation fees, and to you that have gotten scammed, do not trust Duey.