A mobile phone service provider has $3$ different subscription packages for its customers:

$$ Package A: For $$39\mathrm{.}99$ per month $450$ minutes are provided. Additional minutes are

$$0\mathrm{.}45$ per minute.

$$ Package B: For $$59\mathrm{.}99$ per month $900$ minutes are provided. Additional minutes are

$$0\mathrm{.}40$ per minute.

$$ Package C: For $$69\mathrm{.}99$ per month unlimited minutes provided.

Write a complete program called PA$4,$ which calculates a customer$$s monthly bill. It should ask

which package the customer has purchased and how many minutes were used. It should display

the total amount due.