[Vuejs]-What's the best way to go about calculating data with multiple facets?

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If it were me, I would store key-value pairs in a pricing object where the key is the upper or lower limit for a quantity price, and the value is the upper/lower limit for the price multiplier. Like this: 

var pricingMap = {36: 1, 72: 0.85, 144: 0.75, 288: 0.65};

function getDiscount(qty){
    for (var upper in pricingMap) {
        if (parseInt(this.qty, 10) < upper)
            return pricingMap[upper];
    }
}

This way, it is simple to add more quantity ranges and discounts.

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