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<form name="calculator">
<input type="text" disabled id="total" style="text-align: right; background: white; width:">
</form>
<table>
<tr>
<td><input type="button" value="C" style="width: 100%" onclick="calculator.total.value = ''"></td>
<td><input type="button" value="/" style="width: 100%" onclick="calculator.total.value += '/'"></td>
<td><input type="button" value="*" style="width: 100%" onclick="calculator.total.value += '*'"></td>
<td><input type="button" value="-" style="width: 100%" onclick="calculator.total.value += '-'" ></td>
</tr>
<tr>
<td><input type="button" value="7" onclick="calculator.total.value += '7'"></td>
<td><input type="button" value="8" onclick="calculator.total.value += '8'"></td>
<td><input type="button" value="9" onclick="calculator.total.value += '9'"></td>
<td rowspan="2"><input type="button" onclick="calculator.total.value += '+'" style="height: 50px; vertical-align: middle" value ="+"></td>
</tr>
<tr>
<td><input type="button" value="4" onclick="calculator.total.value += '4'"></td>
<td><input type="button" value="5" onclick="calculator.total.value += '5'"></td>
<td><input type="button" value="6" onclick="calculator.total.value += '6'"></td>
</tr>
<tr>
<td><input type="button" value="1" onclick="calculator.total.value += '1'"></td>
<td><input type="button" value="2" onclick="calculator.total.value += '2'"></td>
<td><input type="button" value="3" onclick="calculator.total.value += '3'"></td>
<td rowspan="2"><input type="button" onclick="calculator.total.value = eval(calculator.total.value)" style="height: 50px; vertical-align: middle" value ="="></td>
</tr>
<tr>
<td colspan="2"><input type="button" style="width: 68px; text-align: center" value="0" onclick="calculator.total.value += '0'"></td>
<td><input type="button" value="." style="width: 100%" onclick="calculator.total.value += '.' "></td>
</tr>
</table>
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