Year stickers seltzers price quantity price quantity (dollars per sticker) (number of stickers) (dollars per seltzer) (number of seltzers) 2020 2 215 3 155 2021 4 135 3 210 2022 2 150 3 190. What is the total revenue from sticker sales in 2021?
a) 540
b) 810
c) 270
d) 405