What is the amount of depreciation of a Caravan, after 6 years, if its original cost is $35,000 and the yearly rate of depreciation is 9%.

An off road bike is sold by its original owner after 6 years for $2700, at a 15% yearly rate of depreciation. What was its original price, to the nearest dollar?

As per an industry standard, all vehicles depreciate at $15\mathrm{\%}$ yearly rate. Calculate the value of a vehicle as a percentage of its initial value after $10$ years, correct to one decimal.

A brand new laptop retails for $\$750$. At a certain rate of depreciation, its value is $\$307.20$ after $4$ years. Find the rate of depreciation applied.