Answer:
Step-by-step explanation:
We can solve by means of a system of equations:
let x register $ 10
let y register $ 50
Now, we have:
10 * x + 50 * y = 1080
x + y = 28 => <x = 28 - y
replacing:
10 * (28 - y) + 50 * y = 1080
280 - 10 * y + 50 * y = 1080
40 * y = 1080 - 280
y = 800/40
y = 20
now for x:
x = 28 - 20
x = 8
which means that in total there are 8 register of $ 10 and 20 register of $ 50
