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    var apple = 100;
    var grape = 150;

    /* 以下に「合計: 648」と表示されるよう課題処理を追加 */
    var tax_rate = 0.08;
    var sum;
    sum = ( apple * 3 + grape * 2 ) * ( 1 + tax_rate); 
    document.write('<p>合計： ' + sum + '</p>')