<?php
//исходные данные
$fruits = array();
$fruits[] = array(
  'name' => 'Бананы',
  'price' => 65,
);
$fruits[] = array(
  'name' => 'Ананасы',
  'price' => 90,
);
$fruits[] = array(
  'name' => 'Яблоки',
  'price' => 50,
);
$fruits[] = array(
  'name' => 'Груши',
  'price' => 80,
);
$fruits[] = array(
  'name' => 'Кокосы',
  'price' => 130,
);

class Fruiting {
  public $fruits;
  public $weights;

  public function setData($fruits, $weights) {
    $this->fruits = $fruits;
    $this->weights = $weights;
  }

  private function getPrice($price, $weight) {
    $result_price = $price * $weight;
    return $result_price;
  }

  public function getResult() {
    //перебираем все фрукты
    foreach ($this->fruits as $fruit) {
      //перебираем все веса для каждого фрукта
      foreach ($this->weights as $weight) {
        echo $fruit['name'] . ' ' . $weight . 'кг стоят ' . self::getPrice($fruit['price'], $weight) . 'руб.<br />';
      }
    }
  }
}

$fruiting = new Fruiting();
$fruiting->setData($fruits, array(5, 12, 14, 16, 22, 135, 150, 200, 254, 300, 400));
$fruiting->getResult();
?>