I have tried to solve but I do not get a whole number

Question

The admission fee at an amusement park is $1.50 for children and $7.20 for adults. On a certain day, 254 people entered the park, the admission fees collected totaled 1122 dollars. How many children and how many adults were admitted?

Answer 1

254 people entered the park

c + a = 254, a = 254 - c

(1.50)c + (7.20)a = 1122

(1.50)c + (7.20)(254 - c) = 1122

1.50c + 1828.80 - 7.20c = 1122

-5.70c = -706.80

c = 124

a = 130