Use the supplied rate in the stated direction. A tariff may include a fixed charge or different bands, so total cost is not always directly proportional to usage. Compare options for the actual usage required. Example An illustrative water tariff charges $8 fixed, $0.30 per unit for the first 50 units, and $0.45 per unit thereafter. For 70 units, the bill is 8+50(0.30)+20(0.45)=$32. If 1 SGD=0.72 USD, exchanging 500 SGD gives 360 USD before fees. To obtain 360 USD, the required Singapore amount is 3600.72=500 SGD. Apply a stated fee in the currency and at the stage specified. Label currencies; a numerical answer without them may reverse the intended exchange.

Use the supplied rate in the stated direction. A tariff may include a fixed charge or different bands, so total cost is not always directly proportional to usage. Compare options for the actual usage required.

An illustrative water tariff charges $\$8$ fixed, $\$0.30$ per unit for the first $50$ units, and $\$0.45$ per unit thereafter. For $70$ units, the bill is $8+50(0.30)+20(0.45)=\$32$.

If $1\text{ SGD}=0.72\text{ USD}$, exchanging $500\text{ SGD}$ gives $360\text{ USD}$ before fees. To obtain $360\text{ USD}$, the required Singapore amount is $\dfrac{360}{0.72}=500\text{ SGD}$.

Apply a stated fee in the currency and at the stage specified. Label currencies; a numerical answer without them may reverse the intended exchange.

Comparing tariffs and exchange rates

Comparing tariffs and exchange rates