Toyota uses the margin pricing model to set the selling price for a new component. The total cost to produce the component is R$80,$ and Toyota aims to achieve a profit margin of $25\%$ on the unit selling price. According to the margin pricing formula: Unit Selling Price $=$ Cost$/(1$ Margin Rate$).$ What should Toyota$$s unit selling price be$?$

a$.$

R$133\mathrm{.}33$

b$.$

R$106\mathrm{.}67$

c$.$

R$120$

d$.$

R$100$