Suppose it takes about 18 milliseconds to sort an array of 80,000 random numbers using mergesort. suppose for an array of 160,000 numbers, mergesort runs for 40 milliseconds. for approximately how much time will mergesort run on an array of 320,000 numbers
a) 80 milliseconds
b) 88 milliseconds
c) 96 milliseconds
d) 126 milliseconds
e) 160 milliseconds