Answer:
Step-by-step explanation:
we know that
The simple interest formula is equal to
where
I is the Final Interest Value
P is the Principal amount of money to be invested
r is the rate of interest
t is Number of Time Periods
in this problem we have
substitute in the formula above
solve for r
convert to percentage (multiply by 100)
Okay, here we have this:
Considering the provided information, we are going to calculate the requested probability, so we obtain the following:
So to calculate the probability of the conjunction of two events we will substitute in the following formula:
Replacing:
P(wearing brown shoes or tennis shoes U sneakers)=(30+58-8)/100
P(wearing brown shoes or tennis shoes U sneakers)=80/100
P(wearing brown shoes or tennis shoes U sneakers)=0.8
Finally we obtain that the probability that a randomly selected teacher is wearing brown shoes or tennis shoes/sneakers is 0.80.