Computing value when text equals certain item

[brawlings]

I am calculating invoice amounts based on item name and price. For example:

No till drill (item)= $50/day plus $10/acre

cell A1 = No Till Drill

cell B1 = 1 (# of days used)

cell C1 = 10 (# of acres)

So, if cell A1 = 'No till drill", then I need cell D1 to = ((B1*50)+(C1*10)).

I have multiple items and prices in this worksheet, so I need to generate the formula ONLY if the text in A1 equals specific text.

Is this possible?

[#2]

@brawlings 

Let's say you have a lookup list in R2:T50, with item names in column R, the corresponding price per day in column S and the price per acre in column T.

In D1: =IFERROR(B1*VLOOKUP(A1,$R$2:$T$50,2,FALSE)+C1*VLOOKUP(A1,$R$2:$T$50,3,FALSE),"")

This can be filled down if required.

[#3]

@brawlings 

so if A1 <> "No Till drill", what is the formula in D1?