Musallee looking inside the Quraan during Taraweeh and correcting the Imaam

Q: Please advise with regard to the following:

Is it permissible for a Musallee to look inside the Quraan during Taraweeh? If not, is there any social occasion in which it would be permissible?

If we are 3 people in our Taraaweeh Jamaat - the Imaam and one Musallee is a Hafiz, but their dhor is not so good and plan to improve it by performing Taraaweeh - will it be permissible for the Musallee to look into the Quraan during the Salah?

Income of a salesperson who swipes customers credit cards

Q: I work for company called NEXT who’s CEO has political support for Israel.

Also the company provides a credit card for the customers which has interest in it as well. As I work as a sales girl I have to be on the counter/till while on the till sometimes I have to take the credit cards from the customers as their means of payment.

Can you please tell me if my earning is halaal?