.ladoa{
	border: 1px solid #ddd;
	background: #f7f7f7;
	width: 100%;
	padding: 10px 150px;
	float: left;
	margin:10px 0;

	box-sizing:border-box;
	-moz-box-sizing:border-box;
	-webkit-box-sizing:border-box;
}

.concepto{
	border: 0px solid red;
	float: left;
}

.precio{
	border: 0px solid red;
	width: 200px;
	text-align: left;
	float: right;
	font-weight: bold;
}


@media screen and (max-width: 600px){
	.ladoa{
		padding: 10px;
	}
	.concepto{
		width: 100%;
	}
	.precio{
		width: 100%;
	}
}