solving this problem in linear programming

Hi,

I am lola,I am an agricultur engineering and I am doing my thesis , so please I need some help to resolve this folowing problem for my thesis,

an agricultur desire to plant his land bananas,he has 2 choices of banana A or B. he nneds to know wich plant (A or B) can he plant to have a maximum profit with a minimum expense.

the density and rentability and the fertilisers needed ,for A and B, are in the folowing table:

Cultivars A B

Density/ha 1600-2500(plants) 1680-1785(plants)

rentability

t/ha 40-50 69-75

fertilisers

needed/10 000 m2:

N 250 295

P 25 35

K 800 1200

Ca 150 175

Mg 60 70

S 14 32.5

N cost : 27$ /50Kg

P cost : 24$ /50Kg

K cost : 40$ /50Kg

Ca cos t: 30$ /50Kg

Mg cost : 30$ /50Kg

S cost : 70$ /50Kg

I am waiting your answers;

thanks ..............