From birth: We read to our son often.
August 2020: I saw a recommendation on HN for the book "Teach your child to read in 100 easy lessons".
Aug-Dec 2020: I spent 25-30 hours following that playbook. (15-20 mins per day, 5 days per week, 20 weeks.)
August 2021: Our son (now almost 5yo) reads beyond the level that will be expected of him when he finishes Kindergarten (2 years from now). Most important for me: he's improving (both decoding and comprehension) without our help. He just picks things he wants to read (from his bookshelf, from the library, or from the thrift store), and gets started. He'll re-read books he likes, and abandon others.
Anyone who can read at high school level can follow the instructions in the book I used. Assuming you can find people like that for minimum wage(?), it should be possible to teach N children to read for $500 * N. ($15/hr x 30 hrs = $450, plus some money for materials.)
To put that $500 into context: it's approximately the same as SFUSD spends per student per week.
If you can really teach every child to read, for $8 per student ($110k/14k = $8), that would be a game-changer.