Cumulative tax and Round prices during calculations no function

-- HikaShop version -- : 4.7.5
-- Joomla version -- : 3.9.21
-- PHP version -- : 7.2.34

Greeting Hikashop Surpport,

We had met two problem in hikashop:

1) Cumulative tax no function
- In Service Tax 8%, we want to subtotal + Service Charge 10% then multiply by 8%. Thus, we open the Cumulative tax. However, it doesn't work.

- For example in second attachment, the Service Tax 8% should be RM2.36 ((RM26.80 + RM2.68) * 0.08), not RM2.14 (RM26.80 * 0.08)

- Furthermore, if I close the Service Charge 10%'s Cumulative tax, the Service Tax 8% will disappear

2) Round prices during calculations no function
- We need a function to round up the total price. Thus, we open the Round prices during calculations. However, it doesn't work

- For example, if the total price is RM21.44 which is less then 0.05, will round up to RM21.40; if the total price is RM20.45 which is more than equal to 0.05, will round up to RM20.50.
- Another example in second attachment, the total price RM31.62 should be round up to RM31.60

That's all our problem

Hello,

It seems that in order to better understand the situation, we will need to see all relative configuration, the most simple is to provide us these elements :
- Url link to your backend (administrator)
- Backend user references (with maximum ACL)

Note : Use our Contact us form to provide these references, and don't forget to add an Url link to this topic.
Regards