On the "yes bus" row:
yes taxi + no taxi = total
30 + no taxi = 125
no taxi = 125 - 30
no taxi = 95
On the "no bus" row:
yes taxi + no taxi = total
90 + 185 = total
275 = total
On the "yes taxi" column:
yes bus + no bus = total
30 + 90 = total
120 = total
On the "total" column:
yes bus + no bus = total
125 + 275 = total
400 = total
