Python

Your local utility company charges customers for water usage on a tiered system:

$\backslash$table$[[$Tier$,$Charge$],[$Gallons $0-5999,$$$2\mathrm{.}35$ per $1000$ gallons$],[$Gallons $6,000-20,000,$$$3\mathrm{.}75$ per $1000$ gallons$],[$Gallons over $20,000,$$$6\mathrm{.}00$ per $1000$ gallons$]]$

No mater the total water usage, the first $5,999$ gallons cost $$2\mathrm{.}35$ per $1000$ gallons. Any gallons from $6,000$ to $20,000$ then cost $$3\mathrm{.}75$ per $1000$ gallons. Finally, any water usage left will cost $$6\mathrm{.}00$ per $1000$ gallons.

Program Inputs

Enter your water usage in gallons:

The user will always enter a positive value, no error checking needed.

Program Outputs

Money owed: $XX$.$XX

Replace XX$.$XX with the actual money owed rounded to upto $2$ decimal places

Sample Output

Test Case $1$:

Enter your water usage in gallons: $1000$

Money owed: $$2\mathrm{.}35$

Test Case $2$:

Enter your water usage in gallons: $10000$

Money owed: $$29\mathrm{.}1$

Test Case $3$:

Enter your water usage in gallons: $40000$

Money owed: $$186\mathrm{.}6$

Test Case $4$:

Enter your water usage in gallons: $6001$

Money owed: $$14\mathrm{.}11$