JSFiddle - React, Tailwind, and code Playground
JavaScript
var calc = function(dimensions) {
var l = dimensions[0], p=dimensions[1], h=dimensions[2];
return l*p + l*h*2 + p*h*2;
}
var boxes = [
[30, 20, 18],
[50, 20, 50],
[22, 20, 18],
[90, 25, 25],
[10, 12, 10],
[33, 15, 25]
];
var area = 0;
var areas = boxes.forEach(function(box) {
area += calc(box);
});
alert(area / (100 * 100));