Answer:
17
Step-by-step explanation:
We have the following equation for compounding annual interest
AV=PV(1+i)ⁿ
We have
19200=7400(1+.06)ⁿ
Solve for n
divide both sides by 7400
2.594=(1.06)ⁿ
then use the following rule for exponents

which means that

Solve and get
16.362
which rounds to 17
It’s b i’ve had this before
the upper quartile is 160
2 times 25 equals 50. 3 times 100 is 300. 50+300=350