A computer that cost $1,099 last year cost $999 this year.

Would it be about 9 or 9.1?

.9090081893

is about
.91
times 100 = 91%
or 9% reduction

To determine the percentage decrease in price from last year to this year, you can use the formula:

Percentage decrease = [(Initial Price - Final Price) / Initial Price] * 100

In this case, the initial price last year was $1,099 and the final price this year is $999. Plugging these values into the formula, we get:

Percentage decrease = [(1,099 - 999) / 1,099] * 100
= [100 / 1,099] * 100
≈ 9.1

Therefore, the computer has decreased in price by about 9.1%.