Calculate total price in different currencies

combineReducers.js

const selected = [
  { price: 20 },
  { price: 45 },
  { price: 67 },
  { price: 1305 }
];

const reducers = {
  rubles: function(state, item) {
    const newPrice = state.rubles + item.price;
    return { ...state, rubles: newPrice };
  },
  dollars: function(state, item) {
    const newPrice = state.dollars + item.price / 71.6024;
    return { ...state, dollars: newPrice };
  },
  euros: function(state, item) {
    const newPrice = state.euros + item.price / 79.0133;
    return { ...state, euros: newPrice };
  },
  yens: function(state, item) {
    const newPrice = state.yens + item.price / 0.6341;
    return { ...state, yens: newPrice };
  },
  pounds: function(state, item) {
    const newPrice = state.pounds + item.price / 101.7829;
    return { ...state, pounds: newPrice };
  }
};

const combineReducers = function(reducers) {
  return function(state, item) {
    return Object.keys(reducers).reduce(function(nextState, key) {
      return reducers[key](nextState, item);
    }, state);
  }
};

const priceReducer = combineReducers(reducers);
const totalPrice = selected.reduce(priceReducer, {
  rubles: 0,
  pounds: 0,
  dollars: 0,
  euros: 0,
  yens: 0
});