The selling price, s of an item is s=c+mc where c is the cost of the item and m is the percent markup based on cost. What is the formula solved for m? m=(s-c)/(c) m=(s+c)/(c) s-c=m s+c=m

To solve the formula $s = c + mc$ for $m$, follow these steps:

1. Start with the given equation:
$$s = c + mc$$

2. Factor out $c$ on the right-hand side:
$$s = c(1 + m)$$

3. Divide both sides by $c$ to isolate $1 + m$:
$$\frac{s}{c} = 1 + m$$

4. Subtract 1 from both sides to solve for $m$:
$$m = \frac{s}{c} - 1$$

So, the correct formula solved for $m$ is:
$$m = \frac{s - c}{c}$$

Therefore, the correct answer is:
$$m = \frac{s - c}{c}$$