Last year, Manuel opened an investment account with $7800. At the end of the year, the amount in the account had increased by 6.5% . How much is this increase in dollars? How much money was in his account at the end of last year?

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.