Answer:
0.25%
Step-by-step explanation:
Rate of commission
= (commission*100)/cost of land
=( 20000*100)/8000000
= 2000000/8000000
=2/8
= 0.25%
5^3=125; 2.5^2=6.25. So the answer to your first question is 125, and the second one is 6.25
ANSWER

EXPLANATION
Recall that,

That is why

is equivalent to

This implies that,

This is the same as,

When we are dividing by

we move the decimal point backwards two times.
This implies that,
8×6= 48
4×6=24, 24+24=48
or
(4×6)+(4×6)=2×4×6=8×6