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$\text{Total monthly payments} = 18 \times \$200.00 = \$3600.00$

$\text{Hire purchase price} = \$300.00 + \$3600.00 = \$3900.00$ The hire purchase price is \boxed{\3900.00}$.

$\text{Interest charged} = \$3900.00 - \$3600.00 = \$300.00$ The interest charged is \boxed{\300.00}$.

$\text{Percentage interest charged} = \left( \frac{\$300.00}{\$3600.00} \right) \times 100\%$

The percentage interest charged is $\boxed{8.33\%}$ (rounded to two decimal places).

The advertised cash price ($3600.00) is the original cash price minus a 10% discount.

$\$3600.00 = X - (0.10 \times X)$ $\$3600.00 = X(1 - 0.10)$ $\$3600.00 = 0.90X$

$X = \frac{\$3600.00}{0.90}$ $X = \$4000.00$ The original cash price is \boxed{\4000.00}$.