Manchester United are looking for their striker options in the market. Openda and Guirassy are the most popular names being called with the Red Devils these days. Each one of them would cost them quite a high amount of money for sure. Because both of them are valuable players already due to their impressive performances.
Their teams wouldn't like to let any of them go that easy. Their demand for a transfer fee would be solid. Manchester United are still a rich team of course. If they really feel like they need to sign a striker then they would be ready to spend whatever amount is needed.
I'm not really familiar with these players, but I know they are playing in Bundesliga and they are quite productive this season (score many goals). Loïs Openda is playing in Leipzig, meanwhile Serhou Guirassy is playing in Stuttgart. Because they played impressively, it is surely not easy to sign them. Moreover, they seem playing as the main player in their current teams.
Well, I don't know if Man United has the money or not. Being a rich club doesn't always mean to sign any player. But if Man United really want these players, I guess they must spend more than €50m for each player. Their current market values are more than €40m now, their club must expect more than that amount of money.