Download: Gas Supply JavaScript

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A gas supply company wishes to calculate how much its customers owe on their gas usage.
if customers gas usage is 60 litres or less, a rate of $2.00 per litre is applied. and if customers usage is more than 60 litres, a rate of $1.75 per litre is applied for the first 60, and $1.50 per litre for the remaining.
a program need to be design that will prompt for customer ID and then prompt for the amount of gas Usage for that customer. from the gas usage supplied I am to calculate how much the customer owes and print as a report on the webpage.
at the end of the report, I am also to print some summary data of the total number of customers and the total amount owing.
Customer details below:
custId 1, Gas usage is 80;
custId 2, gas usage is 45;
custId 3, gas usage is 90;
custId 4, gas usage is 34
custId 5, gas usage is 60;
cusrId 6, gas usage is 120;
Download:	http://solutionzip.com/downloads/gas-supply-javascript/