Harol wrote to 15 people, and the cost of postage was $4.08. If it c9st20 cnets to mail a post card and 32 cents to mail a letter. How many postcards did he write

Answer 1

20P + 32(15-P)= 408

20P + 480 - 32P = 408

32P - 20P = 480-408

12P = 72

P = 72/12 = 36/6 = 6 post cards

L=15-6 = 9 letters

20(6) + 32(9) = 120 + 288 = $4.08