6. The simple interest earned in a given time varies jointly as the principal and the rate. If P 3,000 earned P 450 at 6% rate, how much would be earned by P 5,000 at 5% in the same time?
A. P 520
B. P 550
C. P 625
D. P 265

34. The area of a triangle varies jointly as the base and the altitude. A triangle whose altitude is 28 cm and whose base is 6 cm has an area of 84 cm2 . Find the altitude of a triangle of equal area whose base is 8cm.
A. 8
B. 14
C. 21
D. 42

pls tamang yung sagot po sana
if pwede po show your solution