Question

The chart below shows one store's sales of computers, listed by model.
2 circle graphs. A circle graph titled May. Poreg, 262; Quilren, 282; Dinztop, 223; Quilren 2, 135; Juvanto, 148. A circle graph titled June. Poreg, 173; Quilren, 184; Dinztop, 148; Quilren 2, 153; Juvanto, 212.
If the changes in sales between May and June continue at the same rate, what will be the percent change in total computer sales from June to July? (Round your answer to the nearest tenth.)
a.
17.1%
b.
20.7%
c.
34.0%
d.
43.2%

Answer 1

First find totals:
- May total = 262+282+223+135+148 = 1050
- June total = 173+184+148+153+212 = 870

The total change from May to June = 870 − 1050 = −180. If the same change occurs from June to July, July total = 870 − 180 = 690.

Percent change from June to July = (690 − 870)/870 = −180/870 ≈ −0.2068966 = −20.7% (decrease).

Answer: b. 20.7%