An exchange rate is the value of one country's currency in relation to another country's currency. It tells you how much one currency is worth when converted to another.

Given: $\pounds 1 = \text{R}15.10$
Amount in Rands: $\text{R}35\,000$

The number of pounds in $\text{R}35\,000$ is $\boxed{\text{}\pounds 2317.88\text{}}$

Given: \ 1 = R12.00$Amount in Rands:$\text{R}26,500$

$\text{Dollars} = \frac{\text{R}26\,500}{\text{R}12.00/\$}$

The number of dollars in $\text{R}26\,500$ is \boxed{\text{}\ 2208.33}$

Camera cost: $\pounds 234$
Exchange rate: $\pounds 1 = \text{R}15.90$

The camera would cost $\boxed{\text{}\text{R}3714.60\text{}}$ in Rands.