Answer:
a
TRUST ME
Step-by-step explanation:
PLEASE MAKE ME BRANLIEST
Let x = first plane's speed.
We have the equation:
2 hours * x km/h + 1.5 hours * (x+60) km/h = 3135 km.
3.5 hours*x km/h + 90 km = 3135km
3.5hours*x km/h = 3045km
x = 870 km/h.
The first plane is traveling at 870 km/h, therefore since it is 60 km/h faster, the second plane is traveling at 930 km/h.
⇒The answer to the first question would be $69.75.
⇒The answer to the 2nd question would be $36.48.
⇒The answer to the 3rd question would be $42.7.
Here's how to get them:
For question 1: A 55% markup for $45 ⇒1.55*45⇒69.75
For question 2: A 60% markup for $22.8⇒ 1.6*22.8⇒36.48
For question 3: A 40% markup for $30.50⇒1.4*30.50⇒42.7
Small Explanation: The reason why there should be a 1 in front of the decimal (which is the percent, but in decimal form) is because by not adding that number 1 in front of the decimal, you will have to do an extra step.
Anyway, hope this helped! :-)
