Examples of egoism disguised as altruism include large charitable donations, and doing a good deed with the expectation of getting something in return. With the charitable donation, someone may make a large donation to show their own personal wealth. Some people do good deeds and expect someone to do something for them in return, such as a college alumni making a large donation and expecting the college to grant their child admission.
Altruism is being selfless. This involves doing things that are good without expecting praise or anything else in return. For example, being a good Samaritan and helping a stranger who needs a tire changed on the side of the road is an act of altruism. Altruism is a common theme throughout religions. For example, in the Catholic religions, Jesus helped the poor just to help and not to receive praise or help in return.
Egoism and altruism are complete opposites. Egoism involves doing things to flaunt things like wealth or other things that feed greed. With egoism, someone's primary motivation is to either get something in return or show how great they are. Egoism is common in society and it is usually someone being selfish, such as performing a good act in exchange for money or recognition.