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.

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.