Shopify product price editing (1,350 products)

Hi, I need a data inputter to check the prices of 1,350 items. Using Shopify's batch edit product tool (image attached), I'd like somebody to check each product against our supplier's website and ensure that our prices are priced as follows:

Supplier's cost + 75% + 20%
e.g.

Supplier's cost is £100, + 75% + 20% = OUR PRICE will be £210.

Some prices will be correct but some may have changed a little. We need every product checking. This involves typing the product's code into the supplier's website and calculating our price as above.
Some products may not be found - in this event, please make a list of the item's code.

Thank you!