ScreenShot: Check the first arrow. I want to replace 200 with 700.

I have product with custom options. I want to show the price = regular price + option value

In the price.phtml I have found this:

<div class="price-box">
    <?php $_convertedPrice = $_store->roundPrice($_store->convertPrice($_product->getPrice())); ?>
    <?php $_price = $_taxHelper->getPrice($_product, $_convertedPrice); ?>
    <?php $_regularPrice = $_taxHelper->getPrice($_product, $_convertedPrice, $_simplePricesTax); ?>
    <?php $_finalPrice = $_taxHelper->getPrice($_product, $_convertedFinalPrice) ?>
    <?php $_finalPriceInclTax = $_taxHelper->getPrice($_product, $_convertedFinalPrice, true) ?>
    <?php $_weeeDisplayType = $_weeeHelper->getPriceDisplayType(); ?>
    <?php if ($_finalPrice >= $_price): ?>

Suppose the regular price of the product is 500 and Option value is +50 then in the product page how can i show 550 when the page is loaded (without clicking on the option radio button)

I have product with custom options. I want to show the price = regular price + option value

In the price.phtml I have found this:

<div class="price-box">
    <?php $_convertedPrice = $_store->roundPrice($_store->convertPrice($_product->getPrice())); ?>
    <?php $_price = $_taxHelper->getPrice($_product, $_convertedPrice); ?>
    <?php $_regularPrice = $_taxHelper->getPrice($_product, $_convertedPrice, $_simplePricesTax); ?>
    <?php $_finalPrice = $_taxHelper->getPrice($_product, $_convertedFinalPrice) ?>
    <?php $_finalPriceInclTax = $_taxHelper->getPrice($_product, $_convertedFinalPrice, true) ?>
    <?php $_weeeDisplayType = $_weeeHelper->getPriceDisplayType(); ?>
    <?php if ($_finalPrice >= $_price): ?>

Suppose the regular price of the product is 500 and Option value is +50 then in the product page how can i show 550 when the page is loaded (without clicking on the option radio button)

So far I tried this:

(this works fine in app/code/core/Mage/Catalog/Block/Product/View/Options/Type/Select.php)

if ($_option->getType() == Mage_Catalog_Model_Product_Option::OPTION_TYPE_RADIO
            || $_option->getType() == Mage_Catalog_Model_Product_Option::OPTION_TYPE_CHECKBOX
            ) {
             $_productId = $this->getProduct()->getId();
                $_product = Mage::getModel('catalog/product')->load($_productId);
                $spl_price=$_product->getFinalPrice();
                if($count==2)
                {
                    $rent=$this->helper('core')->currencyByStore($_value->getPrice(true), $store, false); 
                }
                else 
                {
                    $buy=$this->helper('core')->currencyByStore($_value->getPrice(true), $store, false); 
                }
                $total_rent = $rent + $spl_price;
                
            }

But doesn't work with price.phtml file.

And i tried to pass $total_rent in this:

<?php $_finalPrice = $_taxHelper->getPrice($$total_rent) ?>

but I suppose it doesn't work this way here.