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basically let's just say for example your current average in the class like all your test scores you know homework all that say you're at a 90 right now right and let's just say that this represents you know according to your teacher your course 80% of what your grade is your final grade and you're wondering what to get on your final exam so we're gonna call this ax it's unknown and let's just say that final is worth 20 percent of your grade okay so 80 percent over here 20 percent over here but you want to end up with a ninety two point five overall because we know that ninety two point five that's gonna round up to a 93 you're gonna get the a in the class that you want right so here's what we're gonna do we're gonna take 90 okay what you have currently times the percentage okay point eight zero and that's going to give you 72 okay plus we're gonna take your final exam score which we don't know what that is yet times twenty percent okay so that's 0.2 zero X and we want the combined these two combined to add up to ninety two point five which is your desired score right so let's go ahead and do this on our calculator but we're going to subtract 72 from both sides of our equation right so that leaves us with how much I've got point five we've got twenty point five and then you can see over here these are going to cancel we get point two zero x equals 20 point five and we're going to divide both sides by 0.2 zero 1 a let's see what this is so we've got twenty point five divided by 0.2 0 100 and two point five so that means you need to get the extra credit right if you're going to get this desired grade that you want on your final exam