An ISP has 3 different subscription packages
a) $19.95 per month, 5 hours access. Additional hours
are $0.75 up to 20 hours then $1 for all additional
hours.
b) $24.95 per month, 15 hours access. Additional hours
are $0.75 up to 25 hours then $0.50 for each
hour above this limit.
c) $29.75 per month unlimited access
Write a program that calculates a customers monthly bill. Ask which
package, and how many hours then display the monthly charge. Also, output
when customers should transition to another package to save money.