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Finding the min value

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So I have a slider on my page. I need to determine the minimum amount via php.

I know this is more a math question than a php question.

I have a variable called \$perCost. This variable is the cost of 1 unit.

I need to determine how many units must be purchased for the total cost to equal at least \$minPurchase.

This value i will then set as the minimum value of the slider.

Any help on this would be much appreciated.

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You haven't explained the problem well enough for me to understand. Is \$minPurchase set beforehand or do we have to figure it out?

If you want to know how many \$perCost for a \$minPurchase, just do a division: \$minPurchase/\$perCost.

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yes for the sake of an example

\$perCost = 0.016

\$minPurchase = 0.2

Although both of these variable may change.

I need to determine how many full units must be purchased in order to meet the minPurchase limit.

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This is elementary school math, a linear one-variable equation.

0.016 × x = 0.2 therefore x = 0.2÷0.016

Substitute it with the input variables

perCost × x = minPurchase therefore x = minPurchase ÷ perCost

The minimum amount needed to reach the price is ceil(\$minPurchase/\$perCost). I use ceil() because if the result of the division is 1.2 you actually want 2 rather than 1.

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