I guess this should be some government employee's pay scale and the GP should most probably mean 'Grade Pay'. The exact answer cannot be given without full details about the 'post' to which you are getting selected.
Broadly the above figures mean that on joining duty, your pay would be the total of three figures --- Basic Pay which is 9300/- in this case.
Grade Pay which is 4200/- in this case.
Dearness Allowance which is currently about 60%. That means, 60% of 9300/- equal to 5580/-.
The total Pay would then be equal to 19080/-.
There could be some specialized allowances like city compensatory allowance, house rent allowance and many such things because of which your total pay would easily touch 25000/- with this condition.
There are some compulsory deductions like provident fund, income tax, and a few such things which will reduce your take-home salary.
After every year of service, the basic pay will increase by a certain amount which would be specified. For this pay scale, I expect an increment of about 500/- or so.
I presume R$ means Brazilian reais, and GP means GBP, i.e. pounds sterling.
At three reais to the pound Sterling, that means a starting salary of £7308, or USS10,962, I hope that is per month *which is the usual way Brazilians quote salaries, meaning £87,696 *US$ 131,544 a year, rising to £96,196,or US$ 144,294 a year. But you had best check the current exchange rate (do a google on Brazilian real exchange rate).