2. When mailing a letter locally, a postage fee of 0.80 yuan is charged for each letter weighing no more than $20 \mathrm{~g}$, 1.60 yuan for letters weighing more than $20 \mathrm{~g}$ but no more than $40 \mathrm{~g}$, and so on, with an additional 0.80 yuan required for each additional $20 \mathrm{~g}$ (for letters weighing up to $100 \mathrm{~g}$). If a person is mailing a letter weighing $72.5 \mathrm{~g}$, then the postage fee he should pay is ( ) yuan.
(A) 2.40
(B) 2.80
(C) 3.00
(D) 3.20
2. D.

Since $20 \times 3<72.5<20 \times 4$, according to the problem, the postage to be paid is $0.80 \times 4=3.20$ (yuan).