[PugetSoundSoldier]

Let’s say that, in 1980 the average tariff was 10%; in 1986 the average tariff was 5%. What was the effective tariff rate in 1986, given that the tariff rate was cut in half, but applied to 20% more products?

[Mojave]

Let’s say that, in 1980 the average tariff was 10%; in 1986 the average tariff was 5%.

I already asked you to explain your term.

Again:

...what are the metrics for determining what the "average tariff" is for purposes of the question?

Is it measured against all imported products or only those subjected to tariff.