Q$2(25\%){?}^{{?}^{?}}100mm$ in diameter and $200$ mm height tube is to be deep drawn from $2$ mm thick steel sheet. The shear strength and the yield strength of the material are $350$ and $150$ MPa $,$ respectively. Determine:

a$)$ Required blanking load

b$)$ Minimum number of drawings if the redrawing ratios are: $1\mathrm{.}45,1\mathrm{.}30,1\mathrm{.}20,1\mathrm{.}10.$