Vue

HTML

<div id="app1">
  <input type="number" v-model.number="param">
  <input type="number" v-model.number="param2">
  <ul>
    <li>{{ resultAll.one }}</li>
    <li>{{ resultAll.two }}</li>
    <li>{{ resultAll.three }}</li>
  </ul>
</div>

Vue

/**
 * для вопроса https://toster.ru/q/543879
 */
var app = new Vue({
  el: '#app1',
  data: {
    param: 10,
    
    params: {
      one: 4000,
      two: 5500,
      three: 6800
    },
    
    param2: 5,
    
    params2: {
      one: 740,
      two: 9999,
      three: 350
    },

  },
  
  computed: {
    resultAll: function() {
    	let result = {};
      let result2 = {};
      let resultAll = {
      	one: null,
        two: null,
        three: null
      };
      
      for(let i in this.params){
        result[i] = this.params[i] * this.param;
      }
      for(let i in this.params){
        result2[i] = this.params2[i] * this.param2;
      }
      for(let i in resultAll){
        resultAll[i] = result[i] + result2[i];
      }
      
      return resultAll;
    }
  }
});