Help with JavaScript code for IF with a price range

[Jessica32164154j1lj]

Looking to have a form that can populate when I enter one rate. I need a javascript that seems relativley easy. 

When I enter a rate in "Box A" I would like "Box B" to formulate, however I would like a price range to be added. 

Example:

"Box A"- (Price for snow removal) Rate can be anywhere from $40-50 to calculate "Box B" (salting rate) which would be $30 for the range of $40-50.00 

Any help is appreciated!!!  

[Karl Heinz Kremer]

Are there any ohter price ranges that you would apply different "salting rates" to? What if the Box A is set to 0? What if it's set to $10? What if it's set to $60? 

You might be able to make the necessary modifications yourself - try this as the custom calculation script for Box B:

// get the current value from "BoxA"

var boxA = this.getField("BoxA").value;
var thisValue = 0;
if (boxA == "" || boxA == 0) {
    thisValue = 0;
}
else if (boxA > 0 && boxA < 40) {
    thisValue = 5;
}
else if (boxA >= 40 && boxA <= 50) {
    thisValue = 30;
}
else {
    thisValue = 50;
}
event.value = thisValue;