4 . Isaac pays 20 USD for a zoo admission ticket . The total amount Isaac pays for zoo admission tickets in a year can be modelled by y�
20x, where x represents the number of tickets purchased per year and y represents the amount of money paid per year .
( a ) Determine the minimum number of tickets Isaac purchased if he spent more than 250 USD last year .
[ 2 ] Jordan joins a zoo admission plan for 90 USD and then pays 5 USD for each zoo admission ticket .
( b ) Write down an equation using Jordan ’ s information , giving the answer in terms of x and y .
[ 1 ]
In 2021 , Isaac and Jordan will each buy the same number of zoo admission tickets and will each pay the same total amount of money .
( c ) Find the amount of money Isaac will pay in 2021 . [ 3 ]
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