S-V AGREEMENT

I am a very curious person when it comes to the mechanics of punctuation. If you don't mind, I would like to ask a mix of grammar and punctuation questions.

One-tenth of one percent of the population "is" or "are" affected by the illness. I SAY "ARE."

One-tenth of the population "is" or "are" affected by the illness. I SAY "ARE."

One in ten Americans "is" or "are" affected by the illness. I SAY "IS."

Two in ten Americans "is" or "are" affected by the illness. I SAY "ARE."

One percent of the population "is" or "are" affected by the illness. I SAY "IS."

One percent of Americans "is" or "are" affected by the illness. I SAY "IS."

Two percent of the population "is" or "are" affected by the illness. I SAY "ARE."

Two percent of Americans "is" or "are" affected by the illness. I SAY "ARE."

Are my answers correct?

Thanks so much in advance for any guidance!!