A mustard plant posses 10 flowers and their each microsporangia posses 20 PMC then how many pollen grain prooduce by this plant

A mustard flower has 6 dithecous stamens, each having 4 microsporangia therefore in 10 flowers total 240 microsporangia are present a/c to que 20 PMC are present in 1 flower i.e 4800 PMC in 10 flower, each forming 4 pollen grains therefore total 19200 pollen grains are formed.