(a) David owns $25,000 worth of 10-year bonds of Ace Corporation. These bonds pay interest every 6 months at the rate of 3%/year (simple interest). How much income will David receive from this investment every 6 months? $ How much interest will David receive over the life of the bonds? $

(b) The value of Maria's investments increased by 20% in the first year and by a further 10% in the second year. The value of Laura's investments grew 10% in the first year, followed by a gain of 20% in the second year. Both Maria and Laura started out with a $10,000 investment. Find Maria's and Laura's increase.

Maria's increase	$
Laura's increase	$