can anyone do this ?

A TaxPayer has a name, a yearly salary and a tax credit (both
floating-point
values).
The amount of tax paid by a TaxPayer is calculated as follows. 20% is
paid on
the first 4,000 and 41% is paid on the remainder (if any). Finally,
the tax credit
is deducted from this amount, but this cannot of course reduce the tax
to less than
zero. For example, if John has a salary of 0,000 and a tax credit of
,000, his
total tax is calculated as follows:
20% of 4,000: +6,800
41% of (0,000 34,000): + 10,660
deduct tax credit: - 5,000
Total tax due:  12,460
Implement in Ruby the TaxPayer class, implementing whichever methods you
deem appropriate. Using this class, write a script that reads a name,
salary and tax
credit from a file called ¡Ètaxpayer.dat¡É, and uses this data to create a
TaxPayer
object. Finally, the name and total tax due from this Taxpayer object
should be
printed to the screen.
A sample ¡Ètaxpayer.dat¡É input file for the above example would be:
John
60000
5000
(

thanks