Explain how to solve this :"

Dear student, 
preassure difference formulae
ΔP=(2T/R)
here T=surface tension= 50×10^-3 M/m
And radius =R= 1×10^-3 m
So 
ΔP = (2×50×10^-3)/(1×10^-3)  =  100 N/m²
Regards.