Elementary arithmetic, with brief notices of its history... by Robert Potts.

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13. A person by selling out of the 3 per cents at 99 realises ~15,345,
and gains 10 per cent. on his investment by the transaction. At
what price did he buy?
14. If ~1000 be invested in the 3 per cent. consols when they were
at 85, and some time after the stock was sold out, and it was found
that ~100 was lost in the sale; what was the value of ~100 stock?
15. A person buys ~750 stock in the 3 per cents when they are
at 981, and 6 months after sells it at 103; what did he gain?
16. A having ~2000, purchased (May 22) stock in the 3 per cents,
then at 96-, but sold out again shortly afterwards when they had
fallen to 94. What does A lose; and what is the portion of the halfyearly dividend paid in July 6 that accrues after A's purchase?
17. How much stock must be bought at 851 per cent., in order that
by selling it out when stocks are at 903, twenty guineas may be
gained?
18. The three per cent. consols were at 98-, and ~740 of this stock,
including commission, cost a person ~717. 8s.; how much per cent. did
he pay for commission?
IX.
1. A person sells out of the 3 per cents at 96, and invests the money:in railway 5 per cent. stock. By this means his income is increased
15 per cent. What is the price of the railway stock?
2. A person sells out of the 3 per cent. consols at 91-, ~700 stock.
After consols have fallen 21 per cent., he buys in again with the same
money. What difference will thus be made in his annual income?
3. A invests ~11,025 in the purchase of 3 per cent. stock at 87-,
and B invests the same sum in the purchase of 4 per cent. stock at
941-; what will be the difference of the net incomes after deducting
income tax at 10 pence in the pound?
4. How much 4 per cent. stock can be purchased by the transfer of
~1000 stock from the 3 per cents at 72, to the 4 per cents at 90?
5. When the 3 per cents are at 91-, and the 3 per cents at 99j,
which will be the better investment? How much is one investing
when the difference in income is a shilling?
6. A person transfers ~1000 stock from the 5 per cents to the
3 per cents when the former is at 110 and the latter at 84; if, at the
end of six months, the 5 per cents have risen to 112, what must
then be the price of the 3 per cents, that he may sell out without
having gained or lost by the transfer?
7. A person sells ~1200 stock in the 3 per cents. at ~86, in order to
invest in bank stock paying 8 per cent.; what price must he pay for
it to be neither a gainer nor loser?
8. Would a person increase or diminish his income by selling ~1157
3 per cent. stock at 83- to purchase into the 34 per cents at 83?
9. A person having his property in the Great Eastern Railway
~100 stock, which is at 521-, and pays a half-yearly dividend of 15 per
~100StOk, rrhnl? o ~ Is 9