To state what is affected, put that item before 에. The choice or method is the subject; cost, timing or condition is what it affects.
Expression and use
Korean example
What is affected
배송방법은배송비에영향을줘요.
Two effects
주문방법은포장상자수와받는날짜에영향을줘요.
Conditions and trade-offs
묶음배송은배송비가적은반면에더늦게도착해요.
Limit the scope
이주문에서는묶음배송상자가더적어요.
Totals already include item cost and delivery. This tests reading, not arithmetic speed. Box counts alone do not quantify a total change in carbon emissions.