According to Planned Parenthood's annual report on page 18, they carried out 327,653 abortions in 2013.
The Guttmacher Institute says the average price paid for an abortion is $451.
This means Planned Parenthood makes upwards of $140 million each year from abortions.
The annual report says on page 21 their revenue from non-governmental health services is $305.3 million. That means 45% of this revenue is from abortion.
The rest of their revenue comes from federal funding and donations, except a $77.9 million from "other operating revenue".
In my mind, there is a difference between revenue from charging a client and revenue from funding and donations. The first is similar to how a for-profit company makes money for products and services rendered, which I would call "earned income". The second is like donations given to a non-profit company, which do not seem earned in the same way. I do not know enough about for-profit and non-profit companies to use better terminology.
Is it correct then to say that almost 50% of Planned Parenthoods earned revenue is from abortion?