Answer:
Harry had $90 and Kayla had $120 at the beginning.
Explanation:
Given:
Initial amount of Harry's money = 75% of Kayla's initial amount.
Harry earned $30 and Kayla earned 25% more.
Harry's final amount = 80% of Kayla's final amount.
Let the initial amount of Kayla be 'x'.
As per question:
Initial amount of Harry's money = 75% of Kayla's initial amount.
Initial amount of Harry's money = 75% of
![x](https://img.qammunity.org/2021/formulas/mathematics/middle-school/p9sq9b3rc5nwoqzhzc8wcaj51b36281l9g.png)
Initial amount of Harry's money =
![0.75x](https://img.qammunity.org/2021/formulas/mathematics/high-school/epw1g02khz37lll0p3rcwfkfeu49wbbbs9.png)
Now, Harry earned $30 more. So, total amount of Harry is given as:
Final amount of Harry's money =
![0.75x+30](https://img.qammunity.org/2021/formulas/mathematics/high-school/28dmojj217hzmkwo32bl2khnlaahk8gwzx.png)
Kayla also earned 25% more of her money. So, final amount of Kayla's money is given as:
Kayla's final amount =
![x+25\%\ of\ x=x+0.25x=1.25x](https://img.qammunity.org/2021/formulas/mathematics/high-school/tfeacv1tqr90ikv65wd015pgywmg8nltzi.png)
Now, again as per question:
Harry's final amount = 80% of Kayla's final amount.
![0.75x+30=0.80* 1.25x](https://img.qammunity.org/2021/formulas/mathematics/high-school/jipbd0gclq6qop8ob7cxx6f4r6y4dxy2s9.png)
![0.75x+30=1x](https://img.qammunity.org/2021/formulas/mathematics/high-school/zacp6zjblxfgblu7gtrvmny0uj01oszrc2.png)
![1x-0.75x=30](https://img.qammunity.org/2021/formulas/mathematics/high-school/7ipyq3rjmn6uajywr8u11j41qe1vbrfw0z.png)
![0.25x=30](https://img.qammunity.org/2021/formulas/mathematics/high-school/dhkypp83836v7dhvvmhm29uwpx80jiunso.png)
![x=(30)/(0.25)=\$120](https://img.qammunity.org/2021/formulas/mathematics/high-school/9pl0q7zd911oijqvnw9o31e1bjql0z1pqy.png)
Therefore, initial money Kayla had = $120
Initial money Harry had =
![0.75x=0.75* 120=\$90](https://img.qammunity.org/2021/formulas/mathematics/high-school/rq7zr0n0zhf4z4mmbefrmmmal8vmimo4pc.png)
Hence, Harry had $90 and Kayla had $120 at the beginning.