Determine which purchase has the lower unit price. Brand A: \( 5 \mathrm{~g} \) for Dhs 1.55 Brand B: \( 5 \frac{1}{2} g \) for Dhs 2.09

Step 1 ：\mathrm{Step~1:~Calculate~the~unit~prices.}

Step 2 ：\mathrm{Brand~A~unit~price:} \frac{1.55}{5}

Step 3 ：\mathrm{Brand~B~unit~price:} \frac{2.09}{\left(5 + \frac{1}{2}\right)}

Step 4 ：\mathrm{Step~2:~Compare~the~unit~prices.}

Step 5 ：\mathrm{Lower~unit~price:} \mathrm{min}\left(\frac{1.55}{5}, \frac{2.09}{\left(5 + \frac{1}{2}\right)}\right)