Reselling an item at a higher price

Q: My husband is working in a private Afghan company that stores oil for America. Sometimes the Americans ask my husband for some goods like paint, furniture or other things. My husband asks the price from the shopkeeper and buys the goods then gives the goods with an increased price to the Americans.

For example, the furniture price is 300 dollars and my husband gives the price as 500 dollars, even the Americans know the real price but they accept the price that my husband gives.

I told my husband that this money is haram but he says that I am not their employee, I work for another company. They ask me to buy goods for them and I give them a quotation then they buy it. This is business. I don't directly tell them that I increased the price but they know. They accept it because they trust me and they need one person to do their work for them since they can't directly buy those things. I spend my time and effort for them in getting those things so the money is not haram. Kindly tell me whether the money my husband charges them is haram or halal. 

Being harassed by a gym instructor

Q: A while before I got married I used to train at a gym. The instructor, a male, had a lot of other males and females in this class. At the time I knew that training in a mixed setting was haraam but I was ignorant and am still trying to repent for this sin. I stopped training after 3 months and then got married 2 years later. Now, after 2 years, the instructor keeps harassing me and making false accusations of me having an affair with him. All this time before I got married I had no contact with the gym or trainer and did not even hear from this trainer. Alhumdulillah, my husband can see that this is nothing but harassment and that I did not commit that sin. I however feel as though I did commit the sin by just being in the presence of men in a mixed gathering and training. He is accusing me of a whole load of false accusations which I did not commit and I have tried to get legal help but the more I fight back the more out of control this situation becomes. I am really afraid that people are going to find out and assume the worst even though I did not have an affair. Please can you advise me accordingly.