What is the sum of all the composite numbers up to 20?
Options:
(A) 130
(B) 132
(C) 124
(D) 145
(E) 166
Answer and stream of consciousness: (B)
Stream of consciousness: 4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18 = 132

During a sale, the price of a pair of shoes is marked down 12% from the regular price. After the sale ends, the price goes back to the original price. What is the percent of increase to the nearest percent from the sale price back to the regular price for the shoes?
Options:
(A) 9%
(B) 10%
(C) 11%
(D) 14%
(E) 90%
Answer and stream of consciousness: (D)
Stream of consciousness: Assume the price = 100
Price during sale = 88
Price after sale = 100
Percent increase = 12/88*100 = 14% approx.

The average of first 13 even numbers is?
Options:
(A) 10
(B) 11
(C) 12
(D) 13
(E) 14
Answer and stream of consciousness: (E)
Stream of consciousness: Sum of 13 even numbers = 13 * 14 = 110
Average = 182/13 = 14

The price of a T.V. set worth Rs. 10000 is to be paid in 20 installments of Rs. 1000 each. If the rate of interest be 6% per annum, and the first installment be paid at the time of purchase, then the value of the last installment covering the interest as well will be?
Options:
(A) 9000
(B) 26699
(C) 96000
(D) 19000
(E) 26711
Answer and stream of consciousness:
(A)
Stream of consciousness: Money paid in cash = Rs. 1000
Balance payment = (10000 - 1000) = Rs. 9000