A laptop loses $15\%$ of its value at the end of each year. It is worth $\$7420$ now. Find its v

Question

A laptop loses $15\%$ of its value at the end of each year. It is worth $\$7420$ now. Find its value $3$ years ago, giving your answer to the nearest dollar. [2] A water tank loses $10\%$ of its contents through evaporation each month. After $4$ months, $51\,840$ litres of water remain. Find the amount of water in the tank at the start, giving your answer to the nearest litre. [2]

Accepted Answer

(a) $\$12082$ ​(b) $79012$ litres

Percentages - Successive Percentage Changes

Percentages - Successive Percentage Changes

Solution:

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