Find number of policies sold.An insurance agent gets a base salary of $250 per week, he also gets an extra $2 per policy if the number of policies...

Out of $450 the agent earned , $250 is his base
salary.

So the extra herned is $(450-250) =
$200.

Therefore the extra $200 is due to the earning of
selling more than 10 policies or more than 50 policies.

So
selling more than 10 up to  50 policies the earning he gets = (50-10)*2 = 80
dolars.

But he earned 200 dollars
extra.

So he has earned $(200-80) = $120 on account selling
more than 50 polies. If  he sells more than 50 policies, he earns 3 dollars , ona ccount
of exceeding  both 10 and 50 limits.

So the number of
policies above he should sell to the extra $120 = 120/3 =
40.

Thereforee in all he should sell 50+40 = 90 policies to
earn $450.

The components of
earnings:

Base earnung =
$250

Extra eanings for 90
policies:

First 10 : nill

11
to 50: 40*2 = $80

51 to 90 : 40*3 =
$120