Answer:
450 feet
Step-by-step explanation:
Since the map was increased by a percentage and that percentage is given we can simply multiply the added percentage to the value of feet per inch in order to get the new amount of feet that every inch represents. Like so ...
300ft * 1.50 = 450ft
Therefore, by multiplying 300 * 1.50 (which is 50% more of the original size) we get 450ft. This means that every inch in the larger map represents a total distance of 450 feet in actual distance.