Given;
120 deer tagged
800 deer caught
16 out of 800 deer caught have tags
This is a proportion problem
a/b = c/d where ac = bd
16/800 = 120/d
16d = 800*120
16d = 96,000
d = 96,000 / 16
d = 6,000
The estimate number of deer in North Carolina is D. 6,000
Use the formula for simple interest:
i = p*r*t
Then i = ($828.75)(0.065)(1.5)
= $80.80
6.5% must be converted to a decimal fraction: 0.065, and 18 months to years, specifically 1.5 years.