Question

他在 $70$ 年代以前发行的南美邮票花费了

His South American stamps issued before the ‘ $70$ s cost him

$\$0.40$

$\$1.06$

$\$1.80$

$\$2.38$

$\$2.64$

南美指巴西和秘鲁。

South American means Brazil and Peru.

$70$ 年代以前指 $50$ 年代和 $60$ 年代两列。

Before the ‘ $70$ s means the ‘ $50$ s and ‘ $60$ s columns.

巴西和秘鲁是南美国家。

巴西在 $70$ 年代以前有 $4+7=11$ 张邮票，费用为 $11\cdot6=66$ 美分。秘鲁有 $6+4=10$ 张这样的邮票，费用为 $10\cdot4=40$ 美分。

总费用为 $66+40=106$ 美分，也就是 $\$1.06$ 。

所以正确答案是 B。

Brazil and Peru are the South American countries.

Brazil has $4+7=11$ stamps before the ‘ $70$ s, costing $11\cdot6=66$ cents. Peru has $6+4=10$ such stamps, costing $10\cdot4=40$ cents.

The total cost is $66+40=106$ cents, or $\$1.06.$

Thus, B is the correct answer.