a)20+30+10+20+20+40+50=180 bilete
b)nr. total de bilete=180
biletele vândute marți =30
180.......100%
30.........x%
x=30×100:180=3000:180=16,66%
c)180:7=25,71 bilete vândute intr-o zi
d)20/180=1/9=0,11×100=11%
e)(20+30+10+20+20)×15+(40+50)×20=
=100×15+90×20=1500+1800=3300 lei