Help please! a merchant paid $3 each for golfing hats that he sold for $4 each. he therefore earned a gross profit of $1 per hat. by what per cent was the cost price increased to provide for this profit?

1. 20%
2. 30%
3. 33 (thirty three) 1/3%
4. 300%
5. none of these.

none of these, it should be 25%

Step-by-step explanation:

let y equal to

the total fare and x is the mile of taxi ride. so the equation is

y = 0.55x + 1.75

since susie has

$10 to spend for a taxi cab, so he can have

10 = 0.55x +

1.75

x = 15 miles of

taxi ride

so the system of

inequality is

10 < 0.55x +

1.75

x > 2