Implement a system for a contactless travel card for the London underground.
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The card does not need to be topped up.
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The card charges the owner's bank account directly when used.
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The card is used by touching in and out at train stations.
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The train system accepting this card has two categorical zones of stations, Zone A and Zone B.
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The stations within the zones are as follows:
-- Zone A Asterisk Antelope Aldgate Angel -- Zone B Bison Bugel Balham Bullhead Barbican -
Travelling within zone B is more expensive than travelling in Zone A.
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The price of zone B is inclusive of travelling within zone A.
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The fares are as described below:
| Single | Day | Week | Month | |
|---|---|---|---|---|
| Zone A | £2.50 | £7.00 | £40.00 | £145.00 |
| Zone B | £3.00 | £8.00 | £47.00 | £165.50 |
-- A Single is a journey from one station to another
-- A Day fare includes all single journies made within a single day.
-- A Week fare includes all single journies made within a single week.
-- A month fare includes all single journies made within a single month.
- If one of the stations is within Zone 2 at any point in a journey, the price for zone 2 will be charged.
- No matter how many journies are made within one of the time boundaries within a particular zone, the price will cap at that time period's fare.