When Matty was born, the cost of a ticket to Mars was $1,000,000. The cost is halved every 10 years. How much will a ticket cost when Matty is 30?
First find the total number of times the cost is halved: 30 years / 10 years/halving = 3 halvings.
Then halve the cost once: $1,000,000 / 2 = $
<gadget id="calculator">1000000/2</gadget>
<output>500_000</output>
500,000.
Then halve the cost a second time: $500,000 / 2 = $
<gadget id="calculator">500000/2</gadget>
<output>250_000</output>
250,000.
Then halve the cost a third time: $250,000 / 2 = $
<gadget id="calculator">250000/2</gadget>
<output>125_000</output>
125,000.

<result>125_000</result>