Please help..GOOD MATH Ppl?


Question:
a retail jeweler sells a pair of gold earrings for $213.90. The jeweler uses a 130% markup based on cost. Based on this information, what was the wholesale cost of the earrings?

What would be the amount of compound interest on $6000 invested for two years at 9%, compounded semiannualy? Round your answer to the nearest dollar.

a store owner buys supplies from a vendor for $8450. the terms of sale are 2/10, n/30. What will be the net amount due if the owner pays the bill by the 10th day after he receives teh supplies?

10 POINTS
help!!1

Answer:
1)the wholesale cost of the earrings: 213.90/230*100 = $93

2)the amount of compound interest: I=PRT/100
=$6000*9*1/100 =$540
I=$(6000+540)*9*1/100 =$588.60

$540 + $588.60 = $1128.60 ~ $1129

3) $2028 (a guess)
jewelry question- $93
I do not know what compounded semi annually means- sorry
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