I'm not sure either comparison is easy to make. With 100 books, you can provide for 100 people at once. A laptop can't do that. And in 20 years, how many of those books will continue to be providing information compared to the laptop?

I think both situations have unique benefits and drawbacks, and ranking which of those are worth more than others is something we don't yet have an objective measure for. As such, the comparison still seems quite subjective, even if we can give concrete numbers to a lot of the comparisons. The answer to which is best might even be situational.

You wouldn't ship the books, you would buy them locally. Most developing countries have local manufacture of books, or at least small scale traders who will import the books and resell locally. This would also boost the local economy a bit.

For reference, I buy my niece some nice books for $1 each. These last the who year and are available everywhere.

Media mail? Were they 25 pounds each?

Media mail is subsidized.

source?

Source: Have ever shipped something via the USPS.

Or https://www.usps.com/ship/mail-shipping-services.htm

Have you clicked the link in my comment? Delivery of books is cheap in third world countries. OLPC was not targeting American students!

Also, you don't buy 100 books at once. A year in school will need about 10 books. Send the next 10 next year.

My local library and schools constantly emphasize that reading your kid 1000 books before they are 5 is a key to success. (I suspect they are mistaking correlation for causation, but I have never checked)