36× 140=5040

On average, the number of disposable fast food boxes used in each hotel is about 140, and the total number of disposable fast food boxes used in 36 hotels is about 5040.

(2) Of the 8 restaurants, 3 used more than 130 disposable fast food boxes in one day, 3/8=37.5%.

That is to say, in these restaurants, the percentage of using more than 130 disposable fast food boxes in one day is about 37.5%.