Roni Kurz: Let x be the amount invested in the CD account, so (13000 - x) is the amount invested in a savings bond:I = Prt where I = interest earned, P = principal invested, r = rate, and t = timeI = 780P = 13000r1 = 0.04r2 = 0.07t = 1780 = x(0.04)(1) + (13000 - x)(0.07)(1)780 = 0.04x + (13000)(0.07) - 0.07x780 = 910 - 0.03x0.03x = 910 - 7800.03x = 130x = 130/0.03x = $4333.33Hope this helps!...Show more
Davida Gisriel: c = amount in CDb = amount in bondc + b = 13000.04c + .07b = 780c = 13000 - b0.04(13000 - b) + 0.07b = 780520 - 0.04b + 0.07b = 7800.03b + 520 = 7800.03b = 260b = 8666.67c = 13000 - 8666.67 = 4333.33$4333.33 in CD, $8666.67 in savings bond.I just created a new blog last night. The first post was on factoring. Although you are not working on factoring right now you likely will be in the future, and I plan on posting to this blog regularly so it is likely that there will soon be several posts that could help you with your math.http://freemathhelponline.! blogspot.com/Please visit and let me know what you think. If you like it, do me a favor and visit the sponsoring adds because that is how I get paid....Show more
Davina Shindler: let x = cdy = bondgives us 2 equationsx + y = 130000.04x + 0.07y = 780multiply the second equation by *25 to getx + 1.75y = 19500and subtract the 1st equation from it to get rid of the x giving you0.75y = 6500y = 8666.67recall x + y = 13000so x = 13000 -yx = 4333.33...Show more
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