Pupils in states

In Arnold's world of 5 identical states, all states have exactly 100 cities. In each city there are 30 schools, in each 9 grades, in each grade 4 classes, in each class 25 pupils.

a- how many pupils attend schools in 1 city
b- how many pupils attend schools in 30 cities
c- how many pupils attend schools in 1 state
how many pupils attend schools in Arnold's world

Final Answer:

a =  27000
b =  810000
c =  2700000
d =  13500000

Step-by-step explanation:

$a=30\cdot 9\cdot 4\cdot 25=27000$

$b=30\cdot a=30\cdot 27000=810000$

$c=100\cdot a=100\cdot 27000=2700000$

$d=5\cdot c=5\cdot 2700000=13500000$

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